Pointing that Ukraine benefited most from the sabotage is not a conspiracy theory. It would be if there was another significantly more likely explanation but there isn’t.

Russian involvement is a bit far fetched to me. It severely limited their ability to export at a good price when gaz sell is how they finance the war in the first place, and removed their main pressure point on Europe therefore making the war considerably harder to win.

A third party would be more likely (there is a long list: could be the USA, a European country which wants the block to align strongly with the USA, or another power benefiting).