No disrespect intended, but just stating facts. I have a fair bit of experience volunteering with homeless people (although not in Indiana, I would assume it is similar elsewhere) A large percentage of the homeless population is mentally/psychologically impaired. They also 'gossip' and form opinions/expand on their thoughts/restate as facts just like the rest of us.
I do not think their comments should be thrown out...but I do think they should be taken into account through a filter of fact vs. suspicion--and their overall mental health.
I watched that West Mesa killer thing on Dateline not too long ago, and the transient population always told LE rumors that the victims were killed and buried out in the desert, and sure enough they were found buried out in the desert. Just because they say something doesn't make it so, but their accounts should have just as much weight as any other witness account.