If you aks me I always treat with reserve every grumble and accusing made online or in interviews by athletes and coaches. Losing place in national team is always very hurtfull, especially for WCh medalist and as you mention Grzegorz is not only Mateusz's coach but also a brother so it's very emotional for him too. And sometimes with emotions we're seeing things what we want to see, not necessary what they really are. I have similar feelings about Karol Zalewski (athletics) who is accusing our men's relay coach Lisowski for not getting him to Doha, about Maciej Sarnacki and Piotr Kuczera (judo) who didn't get to this year WCh or Aleksandra Shelton (fencing) who choose team USA. In all this cases I'm not saying that this people are wrong but I'm also not saying that they are right. Usually the true is somewhere in the middle, very rarely is like one of the side presenting it. And we are masters of inside fighting and quarrels (pol. polskie piekiełko).