Gal has ridden lots of international quality horses. For him to find another horse will be easy because he has been on top of the world with Toto, who is not an easy horse. Basically he can hand pick whatever horse strikes his fancy.
Toto needs a special rider who is sympathetic, but demanding, in order to get the same scores. That is something that is very hard to find, even in the international arena. Besides that it also needs to be someone young enough that if they do fall off, they'll bounce. Hopefully Rath is up to the task, but I think Paul is making a huge mistake not inviting Gal to help transition the horse to a new rider. That was the same mistake made by the Canadian who bought Leibling II in a last ditch effort to make the team. The horse still ended up under Hester on the GB team because the new owner took the horse away from Hester in an attempt to get it going with her own coach. Good thing Hester already had all his qualifying scores on the horse!
They say money doesn't buy happiness -- well happiness doesn't buy horses!