Can you have same characters different star level in your battlegrounds deck.

I had a 5 star kushala (almost maxed out and high sig) and ended up getting her as a 6 star. I upgraded her as a 6 star and added her to my deck with the 5 star version. I noticed in BG that I never got them both at the same time. Is that even possible?
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If you removed someone else beforehand to get 1 spot, adding her (really it just automatically removed her 5*, so it swapped them), you would have still had 1 spot to fill, and would have needed to fill it before you could SAVE your deck.