It should be remembered that during the last 2 years there have been high increases in passenger numbers almost second to no other UK airport.
There has been some reverses recently, United, Iceland air, Norwegian and Vueling to name a few. The major issue has been the failure of Monarch which has removed several destinations (Lisbon/Seville) and capacity from the airport, notably the Canary Islands especially Tenerife.
Yes Ryanair have added 3 aircraft to Manchester but do not forget that already announced is 4 additional aircraft from Jet 2 for BHX compared to last year.