I would agree with you when it came to explore other universe Saiyans, but I do think A T had regrets with only having Kakarot and Vegeta being the only lone survivors of planet Vegeta hence why Broly was added in Super Broly, also I felt that A T left multiple doors open in Super Broly Movie for more Saiyan Survivors, either by what Bardock and Gine did with Kakarot, or When Napa, Raditz, and Vegeta, and the other two Saiyans didn't answer the call to return home I feel like there could have been more of them, now that I think about it the Broly Movie could have been 10x better minus Frieza and had Pegasus as the villain and had support from the scientist incubator lab on Planet Vegeta.