there are actually many more than 6 who have played for both clubs, but I asked for 6 as I thought they'd be fairly straight forward.
Keith Welch wasn't in my original 6 and as it happens there are a further 3 players that have played for both clubs that i'd say would be better known to you then Keith Welch.
So far we have:
Frank Worthington
Jason McAteer
Gavin Ward
Scott Taylor
Keith Welch
There are another 3 that are well known. 2 of them played for TRFC last season!!