Are you all forgetting - or am I mis-remembering? (
I'd go for the latter option...)
Tom was mightily impressed with Rob when the evil so and so first appeared. It caused friction with Tony. He only started mouthing anxiety about Rob when it came out that he was being unfaithful to his wife. I think he expressed some concern for Helen.... But it was Kirsty who was constantly egging him on to turn Rob into an enemy - there's no evidence that he actually, personally felt the same way.
So - there are several ways in which he may be revealed to have been, as he said, "a fraud". Secretly taking Rob's advice, secretly conspiring with him to buy non-organic feed, secretly not hating him at Kirsty's behest, secretly undermining Bridge Farm....
It is interesting that Peggy has, apparently, misjudged everything. She's more than a match for Hazel but it is odd. I must say Tom, although reasonably successful on the whole, has been singularly unfortunate in the people he's chosen to trust: Peggy, the buyer he dumped Kirsty for the first time, Brian, now Rob.
I agree there do seem to be anomalies in the current story. People are slightly having to argue against themselves. I guess it's inevitable when the new Editor is clearly trying to build a very different future for Ambridge. I think it's an exciting process to watch listen to but only as long as it can still be distinguished from a TV soap.
(But anyway, the upshot of all the Bridge Farm turmoil is that the spotlight must be thrown onto Maurice. It's all good.)