You can't parallel the teams the same way as you parallel something else like say, roads for example. You need the previous gen to work on the last gen. It could be argued that Sapphire Rapids was so delayed the emergency backup came too close to the original product so it looks like "parallel".
Either way 64 cores is nothing. They pretty much need to do the Cooper Lake strategy where there's no high end line up at all, just mid end.
@A/// Huh? It's Intel not AMD. Intel plans, builds, and manufactured Sapphire Rapids.
Also it almost sounds like AMD has very little to do with chip making. TSMC is pretty much a printer in this case. AMD does all the work.