It's a bit like the last intake at Thomson. The majority of new joiners were Ryanair. That doesn't mean they have any preference for Ryanair guys it just means a lot of the applications came from that source. Incidentally someone mentioned earlier that there isn't much chance for change of fleets etc at Thomson. Not true apparently. A few ex colleagues told me that from joining on the 737 you could expect a shot at the 787 in as little as three to four years.
Anyway going back to the earlier point I think the same would apply to BA and Easyjet applicants. Most will come from Easy and most that are successful will be Easyjet simply because that's were the majority of applications will come from.