How about the blatant parallels of her and Oden, who didn't let being the next heir of Wano stop him from going out to sea? His loyal scabbards constantly asked him to stay yet he ignored them and left anyway. Sounds familiar.
How does Yamato helping him equate to him leaning on her? He never asked to be taught how to fly. He never asked for her protection. On that same line, Yamato had to be ordered both times by Luffy to be with him and she still ditched him twice to do her own thing. The first time was just cause she was itching to fight. The last one had him begging her to stay and she ignored him.
That doesn't sound like the developing relationship of his personal babysitter that always wants to be with him.
Luffy told Momo that there's nothing in this world he should be scared of. Yamato was speechless and Momo himself agreed the panel after. You then see her taking that to heart when she tells him to stop whining and leaves him even though he was trying to guilt her into not going.
Considering her story revolves around being chained at Wano for decades and forced to be alone, there is emotional weight to her finally having friends and being able to leave her prison.
You completely missed the point in what I said. Regardless, Caribou looking for a way to leave Wano alive is not comparable to Yamato wanting to join the crew. That should be obvious.