Knowing if your hive is really queenless or not seems quite an important thing to establish. It means you are either reassured or if her majesty is dead it means you can get set up to unite those bees to another queen right colony. Perhaps they will need to be moved adjacent to another hive before doing this in decent warmer weather. Cold weather is a good time to be moving hives around an apiary.
A quick inspection now will get you ahead of the game and is certainly not an inspection driven by idle curiosity.
Well ..Let's go back to the original post ... the colony has visible DWV - so I wouldn't be combining them with another.
It's had a heavy varroa load - so I wouldn't be combining them with another unless I was sure that the varroa load was well treated and reduced to at least manageable levels.
He's treated with MAQS which has form for killing queens or at least damaging their ability to lay and has already dribbled OA in December which many beekeepers are taking the more modern stance that it's not a great treatment for bees compared to say sublimation. So.. the colony might be weakened anyway.
It was a late swarm but autumn was very mild and a supercedure queen could have got mated and still be in there .. but she won't be marked.
One of the symptoms of CBPV is nibbled wings so it might be a colony that has more problems than just varroa propensity and DWV .. and you are talking about combining with a healthy colony and prior to that siting them adjacent to a healthy hive ?
I really can't see any benefit in fiddling about with them now .. they will either survive, can be treated for varroa without opening up (£17 12volt OA sublimator on ebay) any time you like. Check the varroa drop by all means after sublimation - no need to open them up. See how they get on... my money is on this colony being a doomed one .. in which case they won't survive till spring and will dwindle ..
Sorry, but I do, occasionally, wonder if you take up a position on here just to be adversarial because there is not one ounce of good sense in what you are saying above.