shortest path between namesakes?

Avishai Cohen (US 1) (bass player) to Avishai Cohen (US 2) (trumpet player): 2 steps.

I believe there's a band that had two different people with the same name in their lineup but I can't remember the name of the band.

Lineup E comes very close:
[bandtoband.com] http://bandtoband.com/index.php?Page=Search&AlbumId=30096

Scott Reeder (US 1) and Scott Reeder (US 2) are two steps apart too.

Python: (Back Street) Crawler had Terry Wilson and Terry Wilson-Slesser -- was that the one you were thinking of?

Yep, that's the one.

Forgot about the two Mike Lewises in DMZ...

[bandtoband.com] http://bandtoband.com/index.php?Page=Search&AlbumId=29639

But I thought it pretty neat that The Angels and The Saints are a mystically religious 7 steps apart, and both contain a bruce called Chris Bailey.