My option is, griff would be great to able breeding and use/not use saddle. Compare with snow owl what has a skill freezing and healing and still breedable. Griff should be the same.
For wyvern and drakes i say no. They are exotic dinos so thats ok if they are not breedable. This is a little mission when we run to get eggs. But saddle for wyvern sure like rock drake.
The only thing,there is a big % to find only low lv eggs in drake nest. And other thing,the max egg lv is 190? (Wyvern/drake). I read a comment where was an idea about max findable egg is 300. I support that. They are not breedable so just a little help and don't need to boost them because with that lv is good enough anyway.
Sorry if i wrote too much.
I hope we get some change soon...