I haven't posted in a while but I'll say I'm a bush guy for the record. Joey has a great voice. He's a strong front man though the half mic stand needs to go. "Only" is the most noteable song I would guess from the Bush era and is been a live staple of their set forever. I've seen them countless times and for the exception of the reunion tour it's always been played.
All that said I think over a long enough time line Joey will figure this song out. He did the versus OK though at time sounded like he was trying to sound like John. I think for the chours he needs to take it up a step (pitch) and belt it.
For the die hard bush guys that didn't like his version, I get it. Keep in mind he hasn't performed this song as much as the rest of the band and it's not in his prefered register. There were some Joey era tunes that never sounded right with John singing. Belly of the Beast comes to mind.
For the die hard Joey guys who feel he is singing it better than John, well whatever. I can't imagine what Joey nut such blinders do to your ears but this is going to be a tougher song for him to sell.