I find some blends, even many blends, need anywhere from a few days to a few weeks to stabilize, air out or whatever after opening the tin. Seems like GLP blends especially are like this. Perhaps it is just because I smoke so many GLP blends as well. So there are two kinds of ready. One is this stabilization. Another is the blend needs more age.
If it is a new blend I haven't tried, I buy one to three tins, open one to try. To give it a fair shake, I let it open (when I say open, I pop the tin, leave the top off for an hour or two, then put the top back on) for a few weeks. Smoke most if not all of the tin. If it is really good, I'll order more to cellar. I found with cigars, good tobacco is always good and gets much better with age. Bad tobacco never becomes good tobacco no matter how long you age it. Just my own experience but accumulated over thousands, if not tens of thousands, cigars (including thousands of Cubans).
Perhaps it would make sense to transfer the contents to a jar for a few weeks to keep it from drying out too much. I've yet to see a tobacco dry out "too much" in a couple of weeks.