Yo, I think the Chris Pratt thing got debunked and they did use the original Leeroy but I cannot find links at the moment.

owlpellet:

I now have two messages saying this— I’ll have to look it up and learn to not blindly trust IMDB, I suppose!

I’d love if it were true, that they used the original guy. I just about had a fit of excitement in vent over it when I heard him.