Which QB starts vs the Commanders?

I don't understand this thinking. This is implying that Haener can't be good nor the future. How do you know that? In his limited snaps, he's already out shown Rattler some and had a depleted Oline and WR just like Rattler.

So why is playing Rattler considered developing while playing Haener is not?
Rattler shows a stronger arm, better scrambling ability, and can make some difficult throws. His biggest weakness seems to be processing speed (takes a lot of sacks) and maybe that could improve from experience. Of course Haener could be good as well. It's kind of a toss-up, and I lean Rattler behind a healthier O-line than before