Pretty sure Swiss was only 2 daily last summer as well so no loss of frequency there.
According to the ACL report, seats for Swiss are down 40% over the full season but only about 12% in the peak week.
Interesting that in the peak week, MAN's total seats are up 3% rather than the 1.3% over the full season. This again suggests that MAN might be flat in the shoulder (non-peak) months such as May.
Page 5 of the report which shows the gains and losses in seats by airline over the full summer season and for the peak week (not checked which week that is but probably late July) is quite illuminating. Apart from Ryanair being plus 170,000 seats, easyJet are up 120,000 thanks to the extra based a/c. Also encouraging is the extra capacity from TCX (120,000 seats net of a reduction by Condor) and 123,000 by TOM.
On the downside, the loss of 495,000 seats on MON just emphasises what an impact that's made on the overall capacity at MAN. The other large negative is Virgin Atlantic which, despite the addition of ATL and extra capacity to the US in peak season, has a net loss of 89,000 seats due to the pulling out of Little Red.
Jet2, despite 2 extra based a/c are down very slightly overall but up over 4% in the peak week.
Incidentally, that 'full' airport at LHR still manages to show a 0.9% increase in ATMs compared to the start of summer'14 with a 3.7% increase in seats. Average seats per passenger ATM is 214 compared to 173 at MAN and 186 at LGW.