There's no reason to have a 13" Air, a two-port 13" Pro, and a four-port 14" Pro (on top of the 16" Pro). The ONLY way I could see it being justified is if the two-port 13" "Pro" was rebranded as just being the every man MacBook, while the Air was designed for ultramobility first and foremost. But even then, it doesn't make much sense when Apple will be able to make the Apple Silicon Air outclass and outperform the two-port 13" Pro.
I'm not doubting Kuo's predictions, but if Apple is taking components that are found currently in either model of 13" MacBook Pro and putting them into the Apple Silicon Air (such as the TouchBar or other internal chip components), it could lead to him thinking that the 13" MacBook Pro is going first when it's actually the Air going first. He did say that they'd be launching pretty close to each other.
I do agree that Apple will be launching two Macs simultaneously and first and I do agree that the 24" iMac designed to replace the Intel 21.5" iMac will be among them. But given that we've actually seen part leaks for the Air and not the Pro, and given that the 4-port Pro had a recent update with current Intel chips (and the 2-port did not), I'm thinking that it's entirely possible that the Air is going first and not the 13" Pro. It's also possible that the 13" Pro is going first as was explicitly predicted; certainly Apple can handily best every 8th Gen Intel based Mac they're currently shipping with a 2018 iPad Pro SoC, so their architecture is ready to start doing that now. The A12Z gets Rosetta 2 performance marks similar to the 2020 MacBook Air's native performance, which means that whatever they put out will only be faster than the current model whether emulated via Rosetta 2 or (much more powerfully) native.
Also, again, the Air having performance that would blow the current Intel 2-port 13" Pro out of the water almost renders the need for a separate machine moot. Why buy a thicker machine with no extra value for more money when the thinner machine does it all?