The A’s are plugging right-hander Mitch Spence into their rotation for at least tonight’s start against the Royals, manager Mark Kotsay announced Friday (X link via Martin Gallegos of MLB.com). It’s not clear whether it’ll be a one-off outing or whether Spence, the top pick in December’s Rule 5 Draft, will be guaranteed multiple starts. Still, given the wide slate of injuries on the Oakland staff — Alex Wood, Paul Blackburn and Joe Boyle are all on the 15-day