[giardini]

segue into something like "Well, I really need another look, another perspective, someone else's eyes on this b/c I think I'm missing something here, and I knew you'd be a good person to ask. I value your input."

And a warning: in your situation you may not know if "you are way more experienced" than he is (he may just be stroking your ego to divert you). I've been in the same situation where time revealed the other guy was hoarding information to his advantage. I talked him into a bit of a reveal.