It would have been better if Cradley used riders not in other teams, but it would be hard to sign a rider for 6 matches rather than a full season! Unless it was someone like Connor Mountain, who maybe decides he is happy to move up the Speedway ladder but happy to do half a dozen matches to give him a fuller schedule!
For Mildenhall's point of view more track time for Jenkins & Kemp should help them improve. Might mean Mildenhall losing to Cradley in the trophy Final though, as they'd get good guests for the aforementioned duo!