meaning noone I guess
well, I'm just speculating here, same as you
I told you my thoughts and I provided my analysis, if you don't like it that doesn't mean that it's a lie
I guess you don't have enough knowledge about how the things work
1. you submit an application which must be accepted
2. if preliminary investigation is required (before opening a case) it supposed to be done
3. this application must be examined and decision should be made about opening a CASE
4. If case is opened then further investigation will be done
So, when Навальный submitted an application (step 1) УБЭП did preliminary investigation (step 2) and didn't find состав преступления thus didn't open the CASE. There were some time spent between step1 and step2
If you submit an application about Putin that spent time between 1 and 2 might be just 30 seconds that's it. Also from my understanding you can't open a criminal case for certain people while they holding certain posts
One more thing, for some incidents one don't even need step1, УБЭП must react just on verbal or written information which is enough to be suspicious
For example if one says that he or she is going to kill somebody it is enough information to move to step2 and no documents required