I already explained. Distribution ain't just individual performance. He made mistake, but didn't mean he was bad. The team up their performance as a whole which means there was more options to pass to. People would remember that blind backpass more than the pass to Sanchez in the build up for the equalizer where Lukaku lost the aerial dual. Look easy a pass, but it requires Matic read the situation and position himself well to retrieve possession there. Why was it not Pogba? Because he doesn't fancy the holding midfield position in the attack phase, but leaves it for Matic.
The football game involved 2 teams. Chelsea was sharp and energetic in the first. In the second half, they lost the intensity. Matic still did his job very well in the first despite that. The second half was easier as thing just went our way.