Yes, many unanswered questions remain, but not the conspiracy laced questions you are asking.
Putins puppet hired Titushky thugs to provoke trouble, they are the most likely suspects who were firing from behind or amongst protestors. I can see how their existence and use by Putins puppet is very inconvenient for the pro-Kremlin narrative you wish to establish. To add, protestors were often times surrounded by police forces.
Regardless of the unaccounted deaths, the beginning of the protests themselves with Putins puppet accepting a bribe tfrom Putin o break the EU deal, the application of uneccessary violence by Putins puppet against protestors, the voluntary abandonment of the presidency by Putins puppet remain the key factors at that time.
