Hmm yeah indeed I think Dalton is certainly capable enough, as I've stated numerous times. If he could defeat Chrono and Marle, doubtful, but possible I think. Yes they are strong, but so is Dalton.
Let me just sum up what I think are his strong points, just so it's clear:
- He has influence and is competent
When Chrono & Co arrived in Zeal it was clear that Dalton had been in charge of the militia there for a long time. That must mean he does his job well and knows how to hold influence and intimidation on people. Also strongly seen when he takes Schala. I thought that was a very cool moment with Dalton. Furthermore, in the construction of the Ocean Palace, he was the one that kept all the Earthbound slaves in a row.
- He has knowledge
He watches over the Blackbird when Chrono arrives, and it's also said he was the man that oversaw the construction of the Ocean Palace. In addition, he recognized the Epoch immediately as Belthasar's creation and engineered wings and lasers on it, and he could control it quite well.
- He is strong
Dalton has many strengths in combat as well. He can summon at least two Golems at once, and probably more. Imagine what Guardia soldiers could do when he just summons five Golems at a time. They would be outmatched already. He can also summon a Golem Overlord and knows strong magic spells, like Luminaire.