Didn't improve though
Which is the crux of the debate.....improve means playing and scoring regularly at a higher level than when playing for us....or at least scoring large numbers when not doing so for STFC.
An interesting case would be Garry Nelson.....when John Trollope signed him from Sarfend, for 10K in 83 he was an out and out left winger, who scored 7 goals in a couple of seasons of Div 4.
We sold him to Plymuff for 15K in 85, still as an out and out winger, but here the manager, who's name escapes me started to use him more as a striker and he scored 20 goals in the same number of games as STFC.
Brighton paid 80K and used him solely as a striker and he scored 45 in 132 fro them....when he went to Charlton then second tier he still scored goals for example 93/94 he was their leading scorer with 15, in a side containing Pardew with Curbishley on the bench for a few games.