Had a look at the playback from last night this morning and Carson turned up about 1730h yesterday for a little while then returned with a "friend" after 2000h when it was raining. Both birds came in near to each other on the ledge so I'm suspecting Carson and Cade even though we have seen Carson more often with Beatrix. Second bird (Cade?) took off right away, Carson came down the ledge to the ledge cam and was hanging out in the corner.
When it went dark I could see him moving on the ledge and onto the nestbox edge (2300-0200 approx) then back along the ledge until this morning when a second bird, which looked to be same size hopped on the ledge as well and the pair of them waddled off down the edge. Too wet to tell the colour on the second bird for sure but I think it was Cade again. Anywho, they toddled off down the ledge, "Cade" all the way to the nestbox edge and then Carson took off from the ledge and "Cade" took off after him a few seconds later. And yes, they left at their usual time - 0532h today.