My big tip here isn't going to answer your question directly, but hopefully it helps you make more efficient progress.
Don't plan on playing with anyone at 5 stars. The only time you should have 5 star champs in battles is when you are getting them XP to 6 them. They are either good enough to rank to 6, or they aren't. If they are, you should be spending the time you are playing with them at 5 in Brutal 12-3 instead, finishing making food to bring them to 6 stars. Everything else is a waste of time and builds. If they aren't good enough to take to 6, why are you wasting time and energy on them instead of working on a better champ.
The ONLY exception to this is when you are finishing out FW21 for Lydia and need one more 50 to get it done based on their kits. By then, you'll have gear that might be decent enough to keep such champs up and going. But you are a ways away from this problem.