I appreciate the logistics argument, and I am sure you are right, but the valuation thing surely depends on the type of tournament they (assuming they are internationals) have. If they are under the radar now and they have fantastic tournaments, then it makes sense if at all possible to do the business now, right?
Plus the main argument in favour of a quick deal with Buendia is that there are other folks sniffing around. If Arsenal are constrained by a sell to buy policy, then if it's me I am banging Buendias door down with a contract to get it done while the competition's hands are tied.