Personally I don't think combining sentinel with gladiator is the best solution but is probably the easiest for now. It would be great if they could rework the whole class into a full main class instead. Gladiator is poorly translated from the original name of sword user and sentinel is not that exactly. There are already many sword types for gladiator which could be easily split up to become half gladiator class weapons and half sentinel class weapons (dagger, short sword, long sword, falchion, scimitar, gladius, spatha, macuahuitl). Someone posted somewhere on the forum to make gladiator an offensive dual sword wielding class and making the current gladiator what sentinel should be.