Considering what we know we can surmise they went all the way down the rabithole. (Theunissen, Rooks, Draaijer, Intralipid). There is at least one link with Epo (Draaijer). Had they not had the intralipid affair they certainly would have been the first big Epo team. Of that I have no doubt at all.
It's what makes Breukink a special case. Considering his earlier performances in the Giro he clearly was not someone made by Epo and yet his joining PDM always made me wonder about 1990. The best we can say is that he didn't really transform and that he did podium in the Giro twice pre-epo.
Breukink, Lemond, Mottet, Indurain, they are the enigma of that era... when did Epo start to show up? GL/CM the clean side, EB the question mark, and MI the adopter... but one who surely was recognized as a GT thoroughbred years before Epo hit the peloton.