It is all about not underestimating their opponents in this round. Bayern, Manchester City and Real Madrid are the favorites in all those games, but there have been surprises in the past. I would be no exception if one of them gets under pressure, but since it is two games to go, I doubt that any of these teams would falter. I rather expect a few superior games by those teams and then we will see what the next round brings regarding the drawing.
We expects our favorite team to come our victorious in every match played but it's quite important these clubs doesn't fall out of track. UEFA Champions League is definitely not a competition for mediocre teams, the title race is only among the best clubs. We have watch and observe the outstanding performance exhibited by these teams, none of them holds back because striving for good results have always been the ultimate goal. You're correct, these elite clubs are opportune to be on the lists because they've become one of the very tough clubs, proven themselves.