Obviously
When SEN turned up from WAT, did all of us "Armchair" route planners not ask "WTF?"
WAT routes are thin-ish. LTN works well, a new airline will obviously pick up the route and run with the ball. Strategy you can understand, work on SEN, DUB obviously has enough pax to make that route work, ORK perhaps also. WAT on the other hand needs volume cities such as LTN to work into. MAN being dropped due to a/c being redeployed.
A network carrier will march in, take on WAT-LTN, WAT - MAN and away ye go. Yes it'll mean basing an a/c there, but it's worked.
Now to speculate "WHO"? Eastern? Flybe maybe building on strategy, already becoming known in the South East.
Regards
Shamrogue