Line will plummet. Your book will adjust the line if you only listed Rogers. If you listed both, then bet will be cancelled. Carpenter is one of those pitchers that moves a line. Rogers has been hot, so Det should still be favored at home, especially if they win big (or at least look better) tonight.
Kenny was -171 at home in game 2 vs. Weaver. Covers says -181. So Carp should be even to +130. They usually inflate teams in a must win back against the wall. i.e. Det favored tonight WTF?
I would wait as line has risen from +186 opener and might be +200 by gametime if pitchers stay the same. Carp on 3 days rest, hmmm. LaRussa hates using pitchers on short rest. I miss the days of Bob Gibson pitching 4x (2 complete games!) + 4 1/3 in relief in '64 Series vs. Yanks. How times have changed...