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Mourinho sees Gareth Bale as the perfect choice and with what I read it no longer a rumor Mourinho seems to be concerned about the player conditions in Wales at the Nations League.
Bale is no longer the same beast in the field of play as you said but he's gaining back his fitness and with someone like Mourinho he could be the beast he once was.
At the best case possible, he would be a good player in Tottenham but he wont be a beast anymore. Premier League is definitely not a soft field like Laliga. He spent most of his time on the bench last season while other player has been working out at their best possible effort
Brighton is actually playing very good football and they had quite a lot of bad luck so far. I am quite sure they are staying in the league and with a couple of points to spare.
As long as Sheffield and Burnley is still playing like a bunch of highschool player, Brighton would be able to secure a safe spot just above the relegation zone. Among the bottom 5 in the standings right now, Brighton is actually the best in terms of scoring goal with 11 goals while 4 others have less 8 goals so its pretty safe to say that they are going to survive this season