It is good to put small swarms together.
Small swarms I use in mating nucs.
If you join them enough and they fiill 2 langstroths, it is real hive then and is able to make honey.
If the small swarms you combine all have a queen how do you chose a queen? Just by chance I guess. I asked because I have never combined swarms as I have never caught enough to have a need to try.