I don't think Baryshnikov is 5'8" because when I talked with him, and being a former member of ABT I often did, he seemed a bit shorter and I'm only 5' 7" and I always thought 'Oh, at last, someone is shorter than me'.
Cynthia Gregory always had to worry about partners because of her height. That's why she was relieved when Godunov joined the company. Remember him? Ivan Nage was also OK for her but felt better with Makarova. I forgot who partnered Cynthia in Firebird but possibly Nage. I'm going back here to the Golden Years of ABT.