Sure. Sevilla is a good team, they can prove it by maintaining his position in 2nd place on the table so far. They actually can compete with Real Madrid and they are doing it now. However, with the quality of their current squad, I am not really optimistic that they can overtake Real Madrid at the top table. Except Sevilla buys some top players in the next transfer window.

Agree. There are still many remaining matches, the position on the table may change at any time. Both Barcelona and Atletico aren't small clubs and they have good squads, while they are competing with weaker clubs for UCL zone. With the current position of these two clubs, they shouldn't struggle too hard for UCL tickets.