Yes, some are hybrid bigs who can play next to another specific type of ones in certain matchups and while the metrics indicate Poeltl is clearly more impactful, their more versatile skillsets are more coveted and they're mostly younger, with a perceived higher ceiling.

Williams, Carter Jr., Holmes and Gafford, all higher impact players, have recently extended or re-signed for significantly less (as an aside, Poeltl probably costs between their range and the recently extended range of Capela, Allen, Adams, Valanciunas).
There's not a chance Bamba sniffs this. Even if a cap space team with a gaping hole at center, like the Pistons or Thunder, is interested, it still won't get to this point. Not with the Magic already committed to Isaac, Carter Jr., Wagner (more of a four) and in good position to draft one of the "big 3".