This is just my personal opinion.He is still the same Mark...

This is just my personal opinion.

He is still the same Mark Diamond, It's just that some people seeing him from a different angle?

He likes to smile when talking ..Maybe that's his personality? Always feel optimistic, happy, confident, friendly and positive?

"he seemed like he wanted to smile after every sentence" - maybe that's the hint of something(information)

I also have friends that like to smile while talking, that doesn't mean my friend lack of credibility.

Mother Teresa once said " We shall never know all the good that a simple smile can do"

And I also believe the most powerful gesture is smiling!