Easy question first.
In regards to the stolen mobility scooter, it’s the owners responsibility to store it securely and if necessary have insurance. The OC is not responsible for owners property.
For the fall, refer this to your insurance company. Tell them you have suspicions about the claimant. If they are any good they’ll investigate before paying out.
Now just asking, why has the committee not issued bylaw breach notices? There seem to be several bylaw breaches. Using this tactic is very effective in modifying the behaviour of recalcitrant tenants.