Well you do have some other options. Hulk and Sentinel both have OTG hits after combo (Gamma Tsunami and L Rocket Punch), you can use an assist to pair with it and keep them hit stunned long enough to finish the OTG. I think Dante Jam Session would be good. Likely connects to all of them, covers a lot of forward ground, long hit stun. Not sure about mid range combos tho, sentinel probably since he can dash in then L rocket to cover some ground and Hulk can only really Gamma tsunami in the corner...but corner happens a lot in this game.
Considerations:
Captain America (shield throw), Dante (jam session), Ammy (cold star), Doom (rocks), Iron man (repulsor), Chun-li (lightning legs), Akuma (tatsu), Ryu (tatsu), Skrull (tenderizer or the flame spin), Spencer (wall bounce), Dorm(portal...at certain ranges), Magneto (grab), Haggar (spin)
I think Dante would fit the team really well. He builds meter, sentinel can cover teleport, hyper allows him to connect with any DHC, Jam session is very good defensively and will likely allow relaunch, and he can do my THC trick....so hulk can run up and recombo!