The chance to 'release' Magic was too good to pass up I assume. Talented? - Yes, no doubt about that, commited to Swindon and riding in GB for many years to come? - I have my doubts. MR has looked at the bigger picture with this move and it's understandable, Doyle will be around the UK for many years to come but Poole will use Magic this year and we'll probably never see him ride here on a consistent basis again, especially if he gets into the GP series.
As for Doyle not making the initial team, I can only guess that he was offered a place on a full-time basis (to avoid have 3 D/U riders) and he declined so they had to look elsewhere......