I have Wu Kong, Kiril, Gormek, Cyprian and Buddy (I have no other 4* heroes). Wu is fully ascended and just need to finish leveling him. The rest are not all leveled yet, but I am working on them daily and just about have enough materials to fully ascend the rest.
I do have Aegir (Which I can not figure out how to use him?!?) and Leonidas which I got recently so have not done anything with him yet.
How best to position the above 4* for best defense and offense.