Disagree.
All of Spencer's moves were the right decision even if they didn't work out.
1. At the merge he knew the smart move was to vote for Jefra instead of Tony or LJ. Since she would have been least likely to have an idol played on her.
2. Putting votes on Woo last week instead of Tony.
3. Planting seeds in Tony's head of an all girl's alliance.
4. Having a relationship with Tony. It saved him twice now.
Spencer is a big threat and is in the minority alliance. Most players in his position would have been voted out by now. I don't think he is an all-time great player, but he is far from being a shyt player.
Spencer has very little in the way of a social game. His "relationship" with Tony is one of circumstance. He could have been gone in place of Jeremiah easily. This isn't a ding to him only but they couldn't even coax Jefra to vote with them.
How are you giving him credit for voting Jefra at the merge? Sincere question as I don't remember it being his plan.
Putting votes on Woo means nothing. What about the vote where they all voted Tony anyway and nothing came of it. This point feels made up to give him credit.
3 couldn't happen at all without Tasha. Whether or not they (Tasha and Spencer) talked and it wasn't aired is one thing to consider but Tony suspected an all girl alliance from Tasha chilling with them in the water for extended periods of time before Spencer said something. He also used Jefra but Tony already knew she wasn't worth 2 cents.
Playing his idol like a dummy, his overall shyt demeanor, one funky immunity win etc., he's a shyt player whose make 0 power moves. I can't give credit for trying