I think Morgan has slumped a bit, but dropping a notch in the rotation was completely and totally expected on Aubrey's return. Aubrey is a very high level proven performer at the 3 or 4 and has not yet come back to her usual form, but in time will. When Azzi, Paige or Aubrey were out the need for Morgan in the rotation was greater.
That doesn't mean Morgan is out of the big game rotation, but does mean the rotation needs to be bigger by one on Aubrey;s return for Morgan to be in it. Geno could use only 8 until Aubrey regains her form, but ultimately the minimum will likely be 9 with her, and Morgan if she is used would be #10.
Although I consider Aubrey way ahead of Morgan at the 3 or 4 overall, because they are so different as players, there could still be situations where Morgan's skill set and versatility is needed. Perhaps a rotation of 9 or 10 depending on game and opponent. Regardless I think Geno will use Morgan on a regular basis against BE competition to keep her used to playing with the rotation players, because it appears that if any other rotation player is not available, Morgan is the likely solution due to her versatility and others that could switch positions.