I don’t understand the baby duck analogy, but it does not fit Trump IMO. As Trump has not addressed Cruz issues mentioned by you, we don’t know what he will say or do.
You know... he may not be a baby duck (I think he is) ... but maybe he’s like an old bitty woman who goes around gossiping about people and refuses to engage with them one on one. .... Nah... he’s a baby duck.