If we keep LeBron smothered, which we intend to, who's gonna be left open for the clutch shot? Monta.
You won't keep LeBron smothered, that's the rub. Nobody can (except for a very select few), and certainly not old man Wallace or Butler. Putting TA on him would expose you in other areas, particularly in the backcourt.
Also, on the topic of Ibaka; sure, he is probably a bit overrated (I've stated this before in other threads), but he is still a star-ish type player. You can't cheat off him too much, as he's extended his range to beyond the 3pt line. I could see Ibaka playing the role of Bosh on this Minny team. Maybe not quite as well, but reasonably close enough.
LeBron isn't a "win" button, as Lucky said.
"Win button", well sure, no. But to beat a team with LeBron (that is competently built-as this Minny team is), you better be overwhelmingly better in almost all other aspects of the game.
You have a better frontcourt, but really, that's about it. I just am not sold that will be enough. Minny has the home court advantage as well. That in and of itself isn't a guarantee of anything, but it is a significant edge.
Here's a a simple, but true, mathematical inequality for you guys: LeBron>(KG+Horford)