Given that Adam is demonstrating strong business acumen, I'm sure he didn't delay the bid just because a couple of large firms asked him to.
If I were Adam, I would've wanted some rationale from them as to why he should wait.
It could've been something as simple as a conditional letter of intent saying that if he would wait for them to do their own inspection, they would match the highest BID plus a minimum % over.
Or they might be courting him as a one-stop shop (they'll do all salvage at all their properties and have the means to handle all kinds of materials (brick, steel, timber, gas, etc).
Who knows, but I have to imagine that Adam wouldn't jeapordize other bids simply because a larger firm came in at the 11th hour.
All my opinion...