The CL team with mainly 6 star players are not too far stronger. There is always a chance to win. The CL team has small squad and is not very deep. If they need to rotate the players or some players are out for injury or suspension, there are chances to steal some points.

Only 2 CL teams were shown. Is the third team a weak one? It is far easier with a weak third team because less miracle is necessary. A good scenario is one of the strong team dominate in this group and your team made no mistake on handling the 3rd team. Then all you need is overcoming 1 probably stronger team.