We're still leaking goals, but at an increased rate since we've lost SHKODRAN.
Without him we've been done for 4 by Liverpool, 2 at Everton, 2 at Manchester City. Before it was generally 1 per game (albeit lucky to only be 1 a game in many of those).
So I think SHKODRAN is a big miss, and even if not in terms of direct goals conceded, maybe he's doing something else on the pitch that's sorely being missed, like being very influential in firing up the team etc.
Can't see Holding being too influential yet at his young age, Koscielny might do a bit but doesn't look like too much and Gabriel reportedly can only communicate with Sanchez/Bellerin/Monreal