Just read that article, obvious slant against Kvyat in the tone.
Kvyat's 2016 season is off to a bad start. He struggled in 2015. The comparison graph that shows the teammates performance for the 23 races they were paired together with Ricciardo having slightly better performance.
I go back to the same fact: Kvyat outscored Ricciardo last season.
I think the decision has more to do with Verstappen possibly leaving if he doesn't get a ride with the A team, than Kvyat's supposed performance struggles...(Danii was also down at the beginning of 2015 compared to Ricciardo yet finished ahead of him in the championship).
I hope Verstappen makes the most out of this opportunity, it sucks for Kvyat that it went down like this.