He really shouldn't be focusing on 3 stars right now and should ignore the Havok. Definetely focus on that CAIW, Hype and Gwenpool. Crossbones is a good investment for the future as mentioned. I'd say focus on Sparky more than anyone else. He'll help you with almost all content and especially once you're done with chapter 4 going Uncollected.
That Doctor Voodoo will carry you through a LOT of content - his guaranteed regen at the start of every fight makes him highly sustainable; his L1 can purge buffs and put a lot of poison on them for good damage, and his L2 is a reliable power control mechanism.
You've also got a lot of reliable damage dealers there who are all worth while working on - Cap IW, Gwenpool & Hyperion in particular.
Gwenpool and hyperion shreds through act 4. Just take them to rank 4. Other choices will be sparky and aa. Also red hulk hits like a truck and yours is duped too.
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cb is good, doesn't need to be duped, r3 decent for sure. If you plan to stick around, better invest in 5*
You've also got a lot of reliable damage dealers there who are all worth while working on - Cap IW, Gwenpool & Hyperion in particular.
Doctor voodoo, Hyperion,cap iw,sparky and thing and mutant go with archangel
will be sparky and aa. Also red hulk hits like a truck and yours is duped too.
Cap - he does need awakening and sig stones though