Tottenham Hotspur hate doing any favours to Arsenal, but they may have just done one unintentionally this summer. The North London rivals share a very fierce rivalry. The two sets of fans just don’t like each other, and the last thing either club would ever want to do is be helpful to the other. Both Arsenal and Tottenham have had a decent window so far, but it’s Spurs who have splashed more cash having signed Archie Gray and Dominic Solanke. One of those deals could now help Mikel Arteta’s side make some good money before the transfer window shuts at the end of August. Tottenham deal could he…