Penfed coupon does not apply to leases AFIK. If for some reason it does, it likely does not stack with the other rebates.
Ally does not appear to offer a better deal, CCAP is the way to go.
Trust the numbers from Edmunds - or even cross reference with what has been posted by brokers and/or those who have signed deals.
Just because the market is perceived to be “flooded” does not mean a certain percentage off is easily doable. Many don’t care if they sit on these, or if rebates and incentives change. I see well over 1000 within 200 miles of me, 8/10 dealers have been stubborn about discounting more than a couple thousand.