This is not a forum for talking about divine inspiration. Any new religion will have impact of older religions in that area and this is a general fact though no devout sikh can accept that.It is not a fact but your misinformed opinion. I am sure you want it to be true, because it doesn't fit in with your narrative.
Because he was a scholar of Arabic and Punjabi and found remarkable similarities between islam and sikhism.Why should I care what TP Hughes thinks ? Why do you have to seek approval from a White man ?