Toshio Ota mortally wounded Marine gunner Henry B. Hamilton of VMF-212 on October 21, for his 34th victory, but was himself shot down and killed moments later by 1st Lt. Frank C. Drury. On October 25, the career of another Tainan Ku. ace ended when Seaman 1st Class Keisaku Yoshimura (9 victories) fell victim to Joe Foss of VMF-121.

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The JNAF underwent another reorganization on November 1, in which all units bearing names were redesignated by number. The Tainan Ku. thus became the 251st Kokutai. In the middle of the month, the group was recalled to Toyohashi air base in Japan to replace its losses. Commander Yasuna Kozono became the new commanding officer, Lt. Cmdr. Nakajima became its air officer, and new personnel were trained by a cadre of 10 surviving veterans, including Nishizawa. By the time he was withdrawn to Toyohashi, Nishizawa's total of personal and shared victories stood at about 55, but the tide of battle was turning in favor of the Americans. The last Japanese troops were evacuated from Guadalcanal on February 7, 1943. From that time on, the Allies would be permanently on the offensive in the Pacific.

While in Japan, Nishizawa visited Sakai, who was still recuperating in the Yokosuka hospital. Updating his friend on events, Nishizawa complained of his new duty as an instructor: "Saburo, can you picture me running around in a rickety old biplane, teaching some fool youngster how to bank and turn, and how to keep his pants dry?" Nishizawa also described the loss of most of their comrades to the growing might of the American forces. "It's not as you remember, Saburo," he said. "There was nothing I could do. There were just too many enemy planes, just too many." Even so, Nishizawa could not wait to return to combat. "I want a fighter under my hands again," he said. "I simply have to get back into action. Staying home in Japan is killing me."

The 251st Ku. returned to Rabaul on May 7, 1943, and resumed operations over New Guinea and the Solomons. Among the Zeros known to have been flown by Nishizawa during that time was an A6M3 Type 22 with the tail code UI-105. On May 14, 32 Zeros of the 251st Ku. escorted 18 G4M bombers of the 751st Ku. on a large raid to Oro Bay, New Guinea. They were met by P-40s and new Lockheed P-38 Lightnings of the 49th Fighter Group. A confused dogfight took place, during which the Japanese claimed 13 Americans (five of them admitted to be probables), while the 49th Group claimed 11 G4M "Bettys" (Allied code term for the bombers) and 10 of their "Zeke" escorts. The actual result was that six G4Ms failed to return to their base at Kavieng, New Ireland, and four returned damaged, while the 251st Ku. lost no pilots at all.

The only American loss was 2nd Lt. Arthur Bauhoff, whose P-38 was downed by two A6M3s, one of which was flown by Nishizawa. Bauhoff was seen parachuting into the water, but the boat that was sent to rescue him found only a pack of frenzied sharks to hint at his fate. The 7th Squadron's P-40Ks attacked the bombers, but 1st Lt. Sheldon Brinson was thwarted by a wildly maneuvering Zeke whose pilot was clearly an old veteran, and he escaped only by diving away. That may have been the P-40 claimed that day by Nishizawa, whose fighting style was certainly consistent with Brinson's description. Another P-40K of the 7th was so shot up that its landing gear collapsed, and the plane was written off, although its pilot, 1st Lt. John Griffith, was unhurt.

The 251st and 204th kokutais took off on June 7 to sweep the Guadalcanal area, only to be intercepted over the Russell Islands by a mixed bag of Allied opposition–Marine F4F-4s and Chance Vought F4U-1 Corsairs of VMF-112; P-40Fs of the 44th Squadron, 18th Fighter Group; P-38Fs of the 339th Squadron, 347th Fighter Group; and P-40E Kittyhawks of No. 15 Squadron, Royal New Zealand Air Force (RNZAF). As on May 14, both sides overclaimed–the 251st Ku. alone claiming 23 victories (five of which were probables), while the Allies claimed a total of 24 Zeros. Actual Allied losses were four F4Us and a P-40, along with several damaged (two of the four damaged RNZAF Kittyhawks had to crash-land on Russell Island), but miraculously, all their pilots survived. On the other hand, of the eight Zeros that were destroyed, seven of their pilots were killed, including four from the 251st Ku. Nishizawa's claims included his first Corsair, which may have been that of VMF-112's commander, Major Robert B. Fraser, who, after downing two Zeros for his fifth and sixth victories, was shot down himself but bailed out safely.

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