Look at the date of the poll and the question being asked. Hindsight is a wonderful thing but the best manager in history replaced Silva (permanently). If anyone choose Arteta over Ancelotti as our next manager in Nov 2019 they need their head testing. It's clear now that Arteta is a great manager; it wasn't clear at that time.
I never wanted Martinez, Koeman, BFS, FSW or Frank because there wasn't enough evidence of their abilities for me. I was keen on Silva, but tbf, he'd been in charge of Hull when they were relegated the season before. Martinez'had just won the FA cup with Wigan ffs and Koeman had had 2 good years with Soton.
It just goes to show we shouldn't be too cocksure about our after-the-fact opinions. Few of the board's decisions were obviously wrong at the time (I don't excuse Sam and Benitez even without hindsight).