I think assuming that Alfred want these guys brought back is probably misunderstanding his reason got sending us in the first place?
We're a semi-deniable option, a reminder of why the Dangled is paid, without political allegiances. There were a bunch of guys in that hall who were stronger than we were, and Wessex is not currently at war - he has other commitments for his firces, sure, but we were not chosen due to a lack of sixty strong men who could be sent away for a week.
We were chosen because it's politically inconvenient for Alfred to attack patriotic English Thanes on behalf of the hated Danes (or so his enemies can spin it) - doubly so because of the involvement of Carolingian cultivators. If he sent Thanes, then Knights and Thanes will shed blood in war on English soil under royal orders, not a good precedent given the open tensions at court, and if he sent Knights, it's the same thing, and it worsens the disquiet from his Earls about Frankish influence.