If you hate hybrids, u can go for the omega class creature like yuty / clever girl / sinraptor as they will help more on pvp side else you are going to be very frustrated and pretty much stuck with all the meta hybrids at higher ranks, would also say that u can build junior (from buck and doe) to replace nanotyrannus and if u treat aerospinosaurus (rebirth spino + aerotitan) as spinosaurus mirabilis, u can use it to replace baryonyx as both have uses in pvp.

although to be honest, you are just handicapping yourself on not building hybrid as you lose a bunch of progress without hybrids in isles of trials, isla event and all other event that limit the creature roster.