In the ARR intro we see Louisoix and the scions praying to the 12 in an attempt not just summon the 12 but also to seal bahamut, later in the coil raids we learn that louisoix uses Tupsimati and the remaining eather to transform into Phoenix to defeat Bahamut. We also see Lady Ice Heart do a simular tranformation.

My question is: with enough resources and a strong collective will could the people summon the twelve? Also if they were successful would it be the actual twelve or just a representation of the twelve?

Thank you for your time. Keep up the good work.