Raphina has finally given Barcelona an equalizer to balance the scoreline on the 54th minutes. I know that Valladolid wouldn't be able to get all three points in this match because they are playing with Barcelona whose attacking force is unstoppable. Barcelona is trying to see how they can double their goal but they haven't seen a good chance to make that happen.
It was a great comeback! I agree, resting key players earlier might be the way to go. While the initial lineup likely wasn't the sole issue, Hansi Flick clearly needed to bring in those substitutes, he had no choice if he wanted the three points

... it's already paying off with two goals (Pedri for Frenkie looks like a good move). One more goal would certainly make it a more comfortable finish. The substitutions made by Valladolid did bring a little change to the dynamic as well.