A platform without AWD is excellent? I can't think of a car that more directly links Lincoln to Ford than a reskin of a Mustang, it would be a monumental mistake. The platform is completely locked to the Mustang and can't be repurposed as anything else, it's not a flexible, or even new, platform. And who exactly is going to buy a reskinned muscle car at Lincoln? I can't think of any product more anomalous for the brand, they might as well bring back the Mark LT to make it abundantly clear they are not serious and are recklessly desperate for cheap thrills and attention. Simply put, the Mustang would make a horrible HORRIBLE Lincoln and nobody would buy it.
Anyway, as I've said, Lincoln very smartly avoided the Mustang for countless reasons and will have a proper coupe when they have the right technology.
Once and for all lets get the re-skinned conversation out of the way. I am not against Ford and Lincoln sharing platforms so long as the platform is of appropriate quality on which to build a truly premium vehicle. The S550 is far more capable of being the base for a modern luxury coupe than CD4 is of being the base for a truly premium sedan.
Neither the 6-Series nor C-Class Coupe are high volume vehicles, but they are high margin image makers. While AWD would be nice to have available on a Mark its not a deal breaker, never has been. If they can suitably differentiate the MKZ from the Fusion, MKC from the Escape, MKX from the Edge, and Continental from the Taurus then it's asinine to even suggest a Mark could not be significantly differentiated from the Mustang. An S550 based Mark would be a sports touring car, not a GT350/GT500 challenger so the muscle car statement is ridiculous.
Finally, BMW is co-developing a sports car platform with Toyota, will that be a monumental mistake? There is ALWAYS
going to be a connection between Ford and Lincoln product, the only question is if they will invest enough to make them truly unique.