Feebles is not a good third base coach IMO, but he can't be blamed at all for Devers' stupidity on that play. He is making sure Holt tags up. Devers is on his own there.
Workman can pitch the 6th, Thornburg the 7th, if the Sox get up by 10 they can have Kelly pitch the 8th, otherwise hope for good Matt Barnes in the 8th and Kimbrel in the 9th.