I have categorized the 391 subjects in the T206 set into different groupings based on relative scarcity. Among that group of 391, I break the top 100 Common Players (non-HOFers) into 4 quartiles:
1. 25 Easy Commons
2. 25 Tougher Commons
3. 25 Difficult Commons
4. 25 Very Difficult Commons
Basically, it will be a challenge for a collector to get all 100, but it is reasonably doable over a several year period. Any common players not in this top 100 will be a struggle to find.
I have Gibson listed in Quartile 2 - "25 Tougher Commons." So, not nearly as easy as, say, Fred Snodgrass (Quartile 1), but not as hard as Bill Hinchman (Quartile 3).
Here's my signed M101-2 Gibson from the Doc Steen collection.