Drop Higgins, Tua, or AP?

I ended up holding off on drafting a defense to give myself more time to hold on to some of the rookies, build some depth, and think about keeper options (allowed two for the following year). Who should I drop in order to start streaming defenses?

Obviously, I would love to hang on to Tua to see if he can get the starting job after week 1.

I would also love to see what Higgins does if AJ Green doesn’t come back healthy.

Ultimately, I guess I realize it’s down to Higgins, Tua, and AP and just looking for some help on the decision. I lean more towards dropping AP now that he’s in a 3 back system and that would give me a little longer to hang on to the rooks for keeper options.