Blackbeard is a scumbag, and I think that when he is pressed he will betray his crew and kill them to take their powers. Blackbeard has no canonical limit to his powers, and he is only theoretically limited by his ability to handle multiple fruits at a time.
So far, Blackbeard has arranged his crew in such a way that if he took at least most of their abilities he would have:
Super strength
Invisibility
Teleportation
Size augmentation
Island possession
Flight
Disguise self/illusions
So, Blackbeard could very potentially use all of these powers at once to become an insane giant monster with Super strength, teleportation, flight, and invisibility. All together these powers do not contradict, and with enough daydreaming (since he doesn’t sleep) about using them all together he could very feasibly control them and become a giant monster with wings who controls an orb of darkness and wields multiple dreams just like the mural 🤐
Aokiji not included here as an obvious outlier
So far, Blackbeard has arranged his crew in such a way that if he took at least most of their abilities he would have:
Super strength
Invisibility
Teleportation
Size augmentation
Island possession
Flight
Disguise self/illusions
So, Blackbeard could very potentially use all of these powers at once to become an insane giant monster with Super strength, teleportation, flight, and invisibility. All together these powers do not contradict, and with enough daydreaming (since he doesn’t sleep) about using them all together he could very feasibly control them and become a giant monster with wings who controls an orb of darkness and wields multiple dreams just like the mural 🤐
Aokiji not included here as an obvious outlier