I think 9 based is the previous BEE max. at SOU.
It is a bit of a mystery as to where this 195 is going to come from, but the update that the airline gave re. Project Blackbird* in November included the following statement:
3 will operate at Birmingham and Manchester airports
– Two to provide additional capacity on high demand routes
– One to provide EJet standby cover for the 19 EJets flying
This implies there is a spare/standby a/c, but to only fly it for 5 to 6 hours a day out of SOU only makes sense if otherwise it was sat at MAN, BHX or wherever not earning anything at all.
*Blackbird was the name given by Flybe to the Project aimed at mitigating the financial liability of the remaining 195's by getting deals done with specific airports (eg, CWL, DSA, EXT/NWI) to get them flying.