I guess there is some hidden connection between Kaido, Momo and Yamato. Kaido is caring for Momo in a strange way, he expected some growth in him since he saw him the last time and is disappointed. Seems the first person Kaido was interested in the change since we know Kaido. Also, Momo having the only working copy-fruit has Momo and this is a copy of Kaidos fruit, coincidence? There must be a connection we don’t know of and possibly Momo doesn’t know either. Yeah maybe the connection is Toki, maybe she is related to kaido, maybe she got his wife after oden died, i don’t know, but Kaidos reaction with momo was pretty suspicious.