he cant come back

he comes back in disc 2

he comes back on disc 2 when you infiltrate iselia ranch.

he will (i relly mean it) come back when the darf in tathalla is hurt
and u fly flaider for the doc. to heal him. then u have to stay in that
city. u will hear knoks from 3 ppl in ur team. ignore all of them.
then u will hear a voice. then u will go outside u will meet kratos.
u will start talking to him. later on when u get the material blade
he will join ur team!

you talk to him in the knight of flonor when altessa is ill (ther will be a voice that says Lloyd

man, i love it when people want Kratos back. Now, when you go to flanoir, you'll check into a hotel. Then you have to say no when Colette, Genis and Sheena ask you to do somethin with them. Then Lloyd will go out for a walk and tada, there is Kratos. Later in the game, if Kratos liked you enough, youll get him back (He's a lot better then Zelos, but he can't hit on girls).