TL:DR - The basic question is, "Is it still ok to discuss the deal with my neighbor even though he just signed with an agent?". I'm fine with using agents but this guy has mentioned "getting it on the market" at least 4-5 times in our first conversation. I absolutely do not care about commissions and am happy to have 2 realtors in the mix, I just don't want the deal to get difficult because of them.

This house was occupied by a guy who died a month ago, it was owned by his uncle but I'd been unable to reach him as he didn't have an address or contact number listed.  The owner(uncle) hasn't been to the house in 40 years.  It's literally starting to fall down and the nephew was a hoarder.  I want to do a flip, which I don't normally do, but I am a remodeling contractor and have experience with hoarding cleanups(not fun at all).  I can see it from my house so I'd like to do it well and help all our home values and make some dough rather than risk it turning into a really crappy flip by someone else.

I just wandered over to talk to the owner and the realtor showed up with all the paperwork to sign.  He didn't seem too happy to hear me talking about buying the property.  Any tips on the best way to proceed to make sure the deal goes through? Some of the recent listings in our neighborhood have been really high and the properties haven't sold, but this agent may have big eyes while I bet the owner just doesn't want to deal with it.  No way it's getting financed.