Allen makes plays in different ways. You can't expect Tua or really any other QB to do it the same way.
Allen doesn't have the accuracy and anticipation Tua has, which are a few ways Tua can still be leveraged to "put on a show".
That's how Drew Brees got things done. And Joe Montana. And really Tom Brady and Peyton Manning too.
None of those guys could put on the kind a show (as you put it) that Josh Allen just did. Because they had to make play in different ways. Rarely ever with their legs, except for Montana when he was younger.
With the right offense, coaching and talent around him, Tua's abilities can be maximized in ways some can't imagine right now.