Inspiration from Barfi? Are you seriously comparing Jhilmil's character to Naren? That's quite a stretch...Jhilmil was very obviously autistic...Naren being confused by the file colors isn't remotely in the same category. And it's not that he doesn't know how to sign...he is whimsical...he signed as he felt like on every page.
Time and again his mother and Arjun have been shown to say that Naren lives in his own world...so he probably doesn't have social/business smarts...he won entrepreneur of the year...so they are showing his character more focussed on innovation...that is about the level of finesse you can expect in an Ekta character anyways...since when have characterizations been 100% realistic and blooper free? But that nowhere means that Naren's character has been changed overnight into Koshish as you were implying in the previous threads.
If there was anything to be HIDDEN about Naren's eccentricities vis a vis these Koshish or Bidaai wala Aalekh type storylines, then they wouldn't have shown that peon and that random girl in the office giving such extensive explanations for Naren's eccentricities to Ankita...they are playing up his eccentricities, not trying to HIDE them under the facade of normalcy.
So as far as I can see, Ekta is trying to show a different kind of eccentric character...not the "mentally child-like" ones that have been done many times on TV anyways.
Ofcourse overnight script-changes are still possible in Ekta land...but I don't think think those have happened yet with Naren's character...they are still establishing his character...and yes he does seem to have a tragic past...but his eccentricities seem independent of that.