Want GAS to be max speed with crit damage triangle. 300+, but really over 310 is ideal.
bast gives him 15% TM, which allows him to go before enemy GAS, even if Rex goes first.
A HY with 1 better speed than GAS is ideal. HY is a faster toon, this can be done pretty easily, if he isn’t faster anything over 300+.
Bast should have speed set with health set. Health primaries are better but aim for a speed over 260.