What kind of people get elected as LREM but then change to MoDem in parliament. What is the biggest difference between these two groups anyways?
I see it as an attempt to distance themselves from Macron when his approval inevitably slumps, without actually relinquishing power.
The Modem has been around as a center-left party since 2007, founded by a non-controversial, well-respected figure in French politics (and former history teacher); LREM is just a vehicle for EM's ego and I'm not sure many of the lifer politicos will want to be in it in 5 years.
It is also possible that seat was reserved for LREM and they were LREMINOs. MD is complicated, since at least a good chunk of old UDF/CDS people has remained in LR.