In terms of seats available from the ACL report, one interpretation might be that the huge loss of 495,000 seats by MON is more than compensated by the additional capacity provided by RYR, EZY, TOM & TCX (about 560,000 seats).
Not to mention the additional 80,000 seats being tipped into S15 by Enter Air and Small Planet. The based Enter Air aircraft in S15 is operating for Cosmos, who in S14 used Monarch for their charter programme. I don't know who Small Planet are flying for, but have no doubt it will be largely to the same sun destinations previously served in S14 by Monarch charters.