the incentive would be there if PAF thinks rd 93 is lacking, which i think is not,
hypothetically IF PAF believed that rd -93 is lacking in power for block 3 requirement, they would have found that back in 2014-2015 during technical study phase and would have already approached Chinese or Russian to get their engine ready by 2018-2020, interesting that is the time around which we heard about rd 93ma for the first time
i believe a 100+ order is an incentive even in case of lacking competition, especially when this is not a purely new engine
chinese have made astonishing improvement of late, i will not be surprised if even ws 13 is ready....
though i think PAF will go fro rd 93ma if needed and i hope it should be ready if needed by 2018-20...
if indeginization is the future push, it will not be bad idea to go for more local production on ws 13 and use similar advance version or same engine for project azm