Ordsall Chord was supposed to remove crossing moves at Piccadilly which it did - and still does for the remaining one train each way per hour - supposedly to increase capacity into/out of Piccadilly to accommodate additional trains in the 2016 Northern franchise which have never been introduced, but the routing via the Chord in itself caused other problems, we will never know whether the full scheme including 15/16 and rebuilt Oxford Road with 4 x 8 car platforms would have overcome these, I suspect partially, but not completely.
This proposal would re-introduce such crossing moves if trains round an Ardwick curve were to go to the Airport
I've said it before and will say it again, stop having the tail wag the dog and turn the Airport into a regional-only station. A change onto a dedicated airport service from P11, or the remaining ones from P13, is not a massive encumbrance, it's a short walk much shorter than from "The Station" to either terminal, or if you prefer from Barrow/Windermere you've the option of Preston or guaranteed same-platform at Bolton. There is then no need to cross the formation.
There's even more of a reason not to have the TPEs serve the Airport - the ideal for these would be a ten car hourly train splitting at Carlisle for Glasgow and Edinburgh, there is certainly the demand. Picc could accommodate that on the low-numbered side, the Airport can't.
What that'd leave you is Castlefield being 2 Blackpool, maybe a Southport, the Chat Moss stopper plus all the CLCs (which would allow half hourly locals east of Warrington), an easy fit, potentially you could even rejig to make everything 195 or 331 (bar the Norwich) so you could do things like mark door positions on the platform. All bar the Norwich would form a metro-style stopping service to the Airport from 13 (one EMU onward to Crewe, whichever happens to fit the paths).
It'd also significantly reduce crowding with luggage on P14, as all the long-distance passengers would be removed from there, and there'd be fewer people waiting around for specific trains with Advances, making the whole thing a lot more like an elevated Liverpool Central than what it is now.