Maybe RM held out for their first bid to come in so late, for us to cave in on the price - unsettled keeper, deadline day, other transfers being more important, and pressure to get it done. Its a smart negotiating tactic - and one RM seem to be happy to use to extract the most out of deals. Ozil sale to arsenal was an obvious one, and I believe we also got ADM 3-4 days before the window because we were happy to meet their asking price.
This time it seems to have worked badly for them. If this was their opening bid for DDG, then I am sure we would have held out for more if it was 1 June, not 31 August.