Replace Santhanam says Karthi to Director Hari

Actor Karthi after his series of debacles in Saguni and Alex Pandiyan has become more cautious on choosing his movie scripts to an extent even his co-actors. Santhanam who has shared screen space with Karthi several times has been apparently dropped from Hari's upcoming movie 'Aruva' upon Karthi's request.
Director Hari had earlier signed up Santhanam for his Singam 2 movie though Vivek was already part of the cast, But when Hari went ahead to sign Santhanam for the upcoming Karthi Starrer,  he was intervened by Karthi who firmly insisted that Santhanam should be replaced. 
This has sparked off reports among K'town that a possible grudge may have arisen between the two, cause of the equal importance Santhanam is given in Karthi movies. 
Sources close to Karthi were quick to cover up the issue stating Karthi replaced Santhanam because he did not want to give the stereotype impression of pairing up Santhanam again and again.