I'm going to regret interacting with you, but how the fuck are you equating the Segunda division with the Champ?
Not that i want to stick up for, or in anyway support, the forum troll...
... but i thought exactly the same as you. The I looked at the OPTA Quality rankings for football leagues around the world... this is the average ranking score for all the teams in that particular league:

Depends how much stock you put on that arbitrary ranking / scoring, but this metric indicates there's little in it between the Champ and Segunda Division.
That said, i don't watch much European footy, and certainly don't watch lower-league European footy, so anyone that does may have a VERY different, much more valid, opinion.
Anyway, regardless, I agree with the general point. Braithwaite did very little in English football, went to Barcelona and averaged 22 games a season across 2 years (barely different to McB in terms of games played), scored a total of 5 goals across that period, then jacked when it got rough. He then went to Espanyol, did fuck all the first season, tried to quit, failed when it became apparent noone wanted him, so came crawling back, had a purple patch of a season, then jacked again earlier this month - last week in fact - and is now apparently playing for Olympiacos...
...the Greek Super Lig being 28th and a good 6 and a bit points behind the Championship in the above OPTA rankings, FYI.