I've never heard of a tampa 3 coverage, tampa 2 is just a variation of cover 2. Tampa 2 is typically ran out of a 4-3 defense, instead of the MLB playing just his cover 2 zone, he's responsible for a much deeper portion of the field, as well as reading for a run play beforehand. Like most zone coverage defenses, bend don't break is the mantra.
So I guess if you'd like you can think of him has a third safety, but for alignment purposes, he will always start in the typical mike backer position. It's been a while and I never played a level of football high enough to really get into intricacy's of specific positions, but the MLB is typically one of the hardest defensive positions to play, he's the QB of the defense. Your physical skillset includes (if you're a good mike), being able to run with TE's and RB's, being strong enough to be one of the surer tacklers on the field, and have enough quick twitch to be able to react quicker. Mentally, there's dozens of things you have to account for. Athleticism get's you far, but you gotta have a good football mind to master the position. Having a guy like that eases a lot of other guys responsibilities out there. Not sure Hanson is the answer, but Eifler is even more of a question mark.