So... any particular reason why nobody's made the obvious suggestion to solve the Drake dilemma?
1. Drake's a mercenary first and foremost. Ergo! He cares more about his professionalism than anything else. At least, he should. Wouldn't be a very good merc otherwise.
2. Assuming #1 is true, the solution is surprisingly simple. Don't threaten his health... threaten his
wallet. Either he agrees to the terms, or his contract with us is terminated and his payment forfeit.
3. If he's really
that attached to the Shadow Nexus, offer a compromise. Don't just jump to the "we need to purge that shit permanently" conclusion. Figure out a way to more effectively suppress it, even if that means exploiting the magic mantra (It's magic we don't have to explain it). Failing that, take it away from him
temporarily. Keep the Nexus locked in a vault that only a Keyblade can open or something. At least then, we can always get it back at a later time in the event that we find ourselves in a bad enough situation to warrant risking it.
*shrug* But hey, that's just what
I would do if I were Tocsax. If you want to know what
Seth specifically would do... well he'd probably do the above, but without all the niceness and professionalism expected from a character like Tocsax. In fact, Tocsax's current solution is probably what Seth would've jumped straight to... only without giving Drake (or the rest of the party for that matter) the luxury of having a say in the matter.
Edit: In case you couldn't tell, it's a very good thing Seth isn't the one in charge of the company. He would have gone straight to the Rick Grimes policy of "This isn't a democracy!".