Each draft is different. Maybe rounds 2-3 picks are much more valuable than in previous drafts.
Back in 1991 we traded pick 11 and our 2nd rounder (pick 14 in that round) to New England for the top pick.
That draft was super-deep, but also very weak at the top. Rocket Ismail was considered the top player in WR-dry draft, and Dallas tried to negotiate to get him over the Toronto Argonauts before settling for Russell Maryland who had been the 5th ranked prospect but had also been coached by Jimmy at Miami.
Maybe this draft is also being considered weak at the top while rounds 2 and 3 are being thought of as not too different than late round 1?
Still, pick 92 is the cheapest price by the standards of any draft I've heard of to jump to pick 3 from 12. Also today, unlike 1991, that pick brings with it the promise of a cheap starter in a salary cap world.
Straight up, Drafttek says it should cost 1000 points to move from 12 (worth 1200) to 3 (worth 2200). That would be at least Dallas pick 20 (worth 850). So one of these sources is wrong.
Or maybe they meant to say Dallas trades 12, 20 and 92 (worth 132) for 3?