Cadmium plated bolts are used with aluminum because they are right next to each other on the galvanic chart so there's a low potential of voltage between the two.
Aluminum and titanium are about as far apart as you can get on the chart so there is a high voltage potential for galvanic corrosion. This combination is worse than aluminum against stainless steel.
Most titanium bolts should be coated as the aluminum is with anodizing most of the time. If while torquing, the threads break through the plating you can end up with corrosion. Might be what happened to your caliper bolt.
There are several different types of anti-sieze. One specifically for aluminum. The copper anti-sieze is designed for stainless steel and is highly conductive. You can look this up on the internet.
One of the advantages of blue Loctite like 243 is it also acts as a sealant. If you fully coat the threads and wipe off the excess after torquing you will have good retention and help prevent galvanic corrosion. Most of us grew up using 242 Loctite but when you use it on stainless and or aluminum, you should use their primer to ensure it cures. It also cures with heat so being so close to the rotors the heat from braking may do the trick.
You can read about this in their technical data sheets. I do not work for them but just work in an industry where we have to take great care in material selection, compatibility, and which chemicals we use.