This makes it seem like “yes you should,” but it’s not very conclusive.
The last 2 days I’ve just been buying out Brunts rotating stock and ripping all the low level blessings off them just in case that’s how the new system will work. However, I would hope that is not how it works and if you have a t4 blessing you’ll just get the same amount of xp as if you had t1-4 blessings.