Little Potato is not fit to carry The Chin's briefing books.  Ben Mulroney and Justin Trudeau happened to become friends while travelling in the same circles in Montreal as young bachelors.  All Brian said initially is that it would be a mistake for Conservatives to underestimate the new (2013) Liberal leader because "whats not to like"" in that he was a good looking, well spoken family man with a famous name.  Regretfully, the Harper inner circle did underestimate Little Potato's political appeal with the large number of low information voters who are attracted to superficial things and easily bamboozled and this helped to cost the Conservatives the victory in 2015.

But it is absurd to claim that Mulroney is quite taken with Trudeau 2.0.  He doesn't hate him as he did Trudeau 1..0 and he knows that The Dauphin has considerable appeal with the low information set.  However, this is not the same as being impressed by Justin's intelligence or accomplishments or executive abilities.