Other fans have been thinking that after Raquel switched sides, there wouldn’t have been much of a reason for the show to keep Ángel as a character, unless he would be involved in some plot lines of his own.
“Why do we keep seeing Ángel often when there is no valid reason to make him participate in the series again?” asked user avnturakk.
However, another theory would see Ángel actually being the one trying to have Raquel switch sides again.
To back this theory up, fans have been referencing a moment in season three when Tokyo meets The Professor on his island and tells him that people like Lisbon never switch sides just once.
Money Heist Part 4 is available to stream on Netflix.