If possible, this would be one of the best moves for Marvel and their progression in the Cinematic Universe.
For those not aware, Thunderbolts is a team of mainly reformed supervillains. There isn’t an exact roster for it due to reincarnations, but the founding members of the team are Atlas, Citizen V, Mach-I, Meteorite, Songbird, and Techno. Of all the properties selected by James Gunn, Thunderbolts is likely the best choice because of this teams connection to S.H.I.E.L.D,. Themes of redemption and the nature of heroism are often featured in Thunderbolts comics. This is something that Marvel Studios can take advantage of when it comes to S.H.I.E.L.D.’s central focus in the Cinematic Universe.
They don’t even have to use the roster from the books. They could do a time skip and say these villains are ones they captured over time. They could be villains encountered in Agents of S.H.I.E.L.D. as well. This team opens up for many possibilities that bring a new light to the Cinematic Universe and I for one hope Gunn goes with Thunderbolts over his other two choices.