I completely disenchanted some troops I was tired of looking at (never going to use peasants, quasits, armored boar, sacrificial priests etc.) and suddenly my chests are opening 50% of the time with those troops. On larger opens (50 chests) I am seeing 3xPeasants etc.
Are the chests random, or if you are missing or low on a troop are the chances (highly) increased to get those troops?
Last 30 chests opened had about 50% peasants, quasits, armored boar, sacrificial priests etc. I cannot get rid of them and they appear to be reducing my chances of getting troops I need. So for now I have stopped disenchanting them as I am sick of seeing them repopulate. They are like roaches!