Not to mention the type of assets they make. I mean even if P5 looks like Catherind through and through, look at Catherine: No one broke their back making those models, haha.
It's fun looking at the
Catherine credits and the
Persona 4 credits and seeing some inevitable cross-over. Seems that P4 had 7 people on 3D modeling while Catherine had 5.
The Persona 4 staff was around 120 people... The size of the Catherine team (2009-2011) was about 100-120 people. In 2009, it was said that the
Persona Team split into two groups with one group working on P3P and the other working on Catherine. Supposedly, in 2010, the two separate groups started to merge again to work on Persona 5.
So, that must mean that the Persona Team is actually pretty big now, being able to work on multiple projects at once and stuff. Seeing that Hashino said that the whole team is focused on P5 in August 2012, I guess it could be possible that 1.5 to 2 times the number of people who worked on Catherine are working on Persona 5. This would explain why the "P Team" was officially trademarked in October 2012, showing that that one team would be important enough for their own name, logo and trademark.