(NB I seriously hope that the GB players don't focus on, or get their motivation from, who's number 24 and 25 in the GB rankings)
I don't think it has anything to do with GB 24 or 25. But with the pair of them being such good mates and Scott is even listed as Jonny's coach on the ITF site, I don't have any problem in them "competing" against each other in the rankings as a form of motivation.