An athletes bones adapt to their training and activity, they get harder and more dense etc. If you are inactive for a year - particularly bad inactivity with booze and drugs - then come into training camp, broken bones are very common because they have lost some of the bone density and adaptation. But they throw kicks and punches with the same force because that's what their brain remembers.
It's not surprising he has had multiple broken bones recently. In fighting you need to be all the way in or all the way out. Probably they realize this with the talk of 3 fights this year.