I think from my experience the past two months that I'm playing with fixed roster this might be happening in cup and cl. I remember from old days ( 2010-2011 ) that I always struggled to win any trophy in cl, I had won few championships and almost all the cups cause that days you played against your friends and mine were always many levels under me so was easy to beat them. So I believe that there is a different system in championship and cl+cup. In cl of course you are playing against other champions but most of the teams if you had a fixed roster are 3* average, 4* stars like 3-5 and 5* 3 max. So as I said up above your thoughts might be already a real thing but in a different competition.