Believe me, I am so sorry for miswording, because I was not trying to mislead you or anyone -- especially additional posters who feel they have to chime in to blast others, when they don't have anything interesting to share about baseball with the board.
Here, let me rephrase: after being acquired at the deadline, Giolito and Flaherty were either cut or left off the playoff starting rotation by their new clubs.
The reason is that they both sucked. And now to back up that opinion, I use a statistic still universally accepted, even on this forum: ERA. Gio had a 6.89 for LA, then a 7.04 for Cleveland (who added him for the stretch run). Flaherty had a 6.75 for Baltimore.
For a team trying to get back into contention, it might be best to avoid recruiting either...