Credentials are only clearly "beyond reproach" when a/we know exactly what they are and b/when they are demonstrably relevant to the objective to be achieved in the job to be performed.  We are in the dark on both of these and we shall likely be kept in the dark on them.

One thing is clear - Mr. Sarkar is an ardent Liberal supporter (and it seems the Liberals are ardent Sarkat supporters).  He ran as a Liberal candidate in 2011 and was defeated and he in 2015 when he ran for a Liberal nomination and was defeated again.

The most probable scenario is that he is a personal friend of Butts, has been a loyal Liberal, needs a job, and as an Indian by origin he will look good as a candidate in 2019 in a Liberal riding with a large south Asian population and will help pacify those folks originally from that part of the world who are ticked off with the fawning, bowing and scraping of the Liberals towards China.

So expect him to be back here as a Liberal "star" candidate in 2019.