No, the Le Baron coupe was definitely a higher-line vehicle than a Plymouth. The J-Body Cordoba probably shouldn't have happened; it was much, much too similar to the Mirada to be either a Chrysler or a Plymouth.
Sounds like a plan to me... except when the "premium" Chryslers coming down the pike seem to be over-styled, under-powered horror shows. There's also the problem that all those former Chrysler-Plymouth dealers want a volume brand. While the obvious answer to the latter problem is to offer Dodge franchises to the Chrysler dealers, that's likely to have a really bad taste for the existing Dodge dealers.