I wouldn't call it the "wimpiest" grade. It's the most ductile (least hard), and therefore the toughest. Hardness is not necessary for handle scales. because the function of the scales is to just be held comfortably and with grip by the human hand. At a Rockwell B hardness of around 80, CP titanium (grade 2) is way harder than softer materials like wood and plastics that are often used in knife scales. If anything, the greater ductility of CP titanium vs 6Al-4V is more desirable when used in scales, because a more ductile scale is tougher and will be less likely to crack under hard impact (like if the knife was dropped or the handle was used to hammer something). Plus, from an economical perspective, CP titanium is cheaper than alloyed, and because it is softer it's easier to machine, which means less cycle time during machining (the milling program can be set to a higher feed rate) and less wear on the milling tool.
Personally, I find titanium, or any metal, to be a poor handle material compared to composites like G10 or fiber-reinforced nylon. I live in a cold climate, and metal scales are more thermally conductive, meaning they get cold when I'm outside in the winter. They also give me less traction than peel ply G10 or FRN, and make the knife way more expensive.
You would need to either ask the maker, or have the scales Rockwell-tested or put under an identifying spectrometer, to figure out what grade of titanium your scales. Not really a good way to do it yourself, unfortunately.
