Warning: Full spoilers for the episode follow…
“He’s going to have sex with it the second we walk out the door.”
While there was never any real doubt regarding the adverse, life-halting effects Dennis held over his fellow Gang members, Always Sunny’s Season 13 premiere, “The Gang Makes Paddy’s Great Again,” solidified things for any doubters or waverers.
We picked things up a few months after Dennis’ exodus, with Dee, Mac, Frank, and Charlie blossoming under the stern tutelage of Cindy, a new take-charge schemer played by Mindy Kaling. Cindy’s plans work, Paddy’s is a success, and the Gang, more or less, is feeling a sense of satisfaction and specialness they’ve never before experienced. Frank’s not a total fiend, Dee has self-esteem, Charlie seems relatively stable, and Mac…well, okay.
Source: IGN.com It's Always Sunny: Season 13 Premiere Review