A draw for the match is not a decent result for Bilbao, because Bilbao can really control the game by winning in many statistics. With the victory from the statistics that Bilbao has, then Bilbao should be able to score at least one goal and win three points in that match.
But indeed, the draw is worth it for Osasuna because they can play with good defense and discipline. But for Bilbao, who are playing at home with such a good statistical advantage, a draw is not a decent result for Bilbao. But yes, maybe that is indeed the limit of Bilbao's abilities, maybe they are still not so good at making the final finish.
Osasuna struggled all through that match because Atletico Bilbao was in total control of the game. Bilbao might not have such a good opportunity to grab the full three points in such a match the totally dominated. Nicholas Williams was very wasteful in that match. He had close to three clear chances to score but he wasted all of them. I think Osasuna would be very happy with the result because they didn't deserve a point. But they defended very well but failed to make any impact in the attack. Both teams are at the middle of the league with Bilbao occupying the seventh and Osasuna in the eight position. Which means both teams need to put more effort for them to qualify for any European football next season.