[AltF4me]

I think the OP's question was maintaining the higher quality stream, not the act of ripping.

[gruez]

That doesn't seem hard to pull off. Just record the stream multiple times and splice/replace the low quality bits.

[kmeisthax]

The FTP topsite scene is extremely competitive and anyone doing multiple rips to splice together would lose the race to leak the show.

[Cyph0n]

The best WEB-DL groups are internal P2P - FLUX (HDB) and NTb (BTN).

They both (afaik) do hybrid releases by taking e.g. audio or DV metadata from one service and merging it with another source.

Funnily enough, even for UHD remuxes, P2P groups are top-tier (like Wildcat and Framestor).