FYI - I don't just make stuff up or post ad hominem. I watch many NFL related shows and read numerous Internet articles. I get most of my information from former GMs and HCs, Pioli, Casserly, Angelo, Devaney, Savage, Billick, Mariuci, Gruden, Edwards, Parcels, Johnson etc. and I also follow a couple of former scouts.
Example:
http://sulia.com/channel/football/f/c7b8e011-f46f-488a-90a8-7b8ed78bc550/?source=twitter
What I have learned from reading/watching these guys over the years.
Not to long after the NFL draft, College Scouting Departments begin their preparation for the upcoming year. Up through and the completion of the Bowl Games scouts are evaluating, preparing and cataloging their respective scouting reports on players who were eligible for the next draft when the new seasons start. Beginning with the first underclassmen declarations until The Combine, scouts then begin the process of evaluating, preparing and cataloging underclassmen who have declared for the draft. After the Bowl Games and prior to The Combine is when team draft boards begin to take their initial shape. The end of February, College Scouting along with GMs and HCs are in Indy for The Combine. After the Combine, draft boards, as discussed by Jerry Angelo, make their biggest shifts. March the scouts are attending Pro Days and polishing their reports. After the Pro Days and before the Draft is when most teams final draft board are set.