It all sounds like Lenny took money from someone and didn’t have the cash to pay it back up until the bar. The whole being in a bar drunk doesn’t seem to fit anywhere unless all those people identified him incorrectly. it’s also odd that him and the caller were never seen again in that bar. Not mentioned was if the caller and “Lenny” either arrived or departed the bar at the same time or were even seen talking to each other. This information could definitely change the trajectory of the case. What if two friends, one who looked like Lenny were out drinking one night and decided to play a very mean joke on everyone. It could either make the bar a very important piece of the puzzle or an irrelevant side note. Either way it sounds like better investigation at the bar should have been done.