yes, it actually was in the theatrical pre-SE release... but I meant to insert even more references to Anakin, remember that in the rebels mind, since anakin died as a Jedi, he never ceased to be a great guy, and yet a hero and someone who they're convinced would join their cause.
So yes, that line is fine tho it seems to be a little odd now. It should be a deeper reference to Anakin... More of an astonishment... not something "hey I fought with your father" but more a "what? truly did he have a son? wtf?, u just can't measure how helpful it'd be if he was here now". or something like that, to elevate Anakin Skywalker to the status of Republic Legend.