The thing is, if he decided to be on the list and then withdraw afterwards, Germany would have the chance to replace him and so Haas might have been able to play. Thats why I'm upset.
I don't understand that argument : Haas was not ranked highly enough even for the international criteria then the Germans couldn't have replaced him by another German, it doesn't work like that (I know that considering what happened in 2008 when there were many more withdrawals)
imagine Mayer had done what you say : he would have been replaced by the first international alternate who might have been Dimitrov (lowest entered on the entry list) or another one of the invited players ranked higher than Haas in the rankings after Roland-Garros, which were the ones used to enter the Olympics.
Anyway, except if there had been lucky withdrawals, I don't think it would have changed anything for Haas.
Not even speaking that Haas didn't respect German criteria.
The main problem for Haas is another one : he could really have got an invitation from the ITF if the Germans had asked for it. But it has nothing to do with Flo Mayer.