I think he was a savant, and I really admire and respect his kosh, but he wasn't our Guru ji, but human just like us, and thus susceptible to weaknesses and mistakes, like humans are. How was he not going to get influenced by those who were controlling Panjab and what they were pushing to some degree? Plus he must have been influenced by the new protestant education system that was being pushed, and even by his mate Macauliffe. It isn't really controversial when you look at it that way. I mean the Chandhi thing had lots of 'knickers in a twist' too. It was people trying to hammer Sikhi into some abrahamic mold because the anglos put doubt and complexes in their heads. Plus divide and rule tactics.
Be nice if you could dig up and share what he said his father told him (as you alluded to above) sometime btw.