Last minute replacement. Munhoz obviously wanted the fast-track rather than win another 1-2 fights...since that fight he's faced Hobar and Sanders, as entry level as it gets at this level. I agree, rough debut, but the UFC clearly knew he was a bluechip prospect and have since taken it slowly with him.
Point I'm trying to make is:
This is the UFC. You sign, you face a contracted UFC fighter who is always gonna be someone who could win a title on the regional circuit at the least. There are no 3-2, 4-3, 1-0 guys signed for one-off fights in the UFC. Bellator give guys a few jobbers before they get the bigger test, IMO - if you're good enough to be signed to a major promotion, you shouldn't be mollycoddled. Yes, you shouldn't be given contenders immediately but in the UFC, the bottom-ranked guys in each division are still damn good fighters.'''
Look at Jumabieke Tuerxun. They specifically signed a 5-0 Philippino dude who hadn't fought for 2years, for his debut and he still lost. They can't do anything more than that, for a new signing - signing a low-level guy who's been inactive for 2yrs, just so you can get a comfortable debut and acclimatise.