Now that I'm at home i can give you more info about your concerns. A note I'm not going to write here all the combinatory calculations because it will be long and boring so I'll try to keep it simple.
With the old system, so 8 sp and underlying neutrals, we should focus on which sp can give this issue.
First of all we have a max position = 1 so norte is not a problem at all, because or it's splitted between two players or one of the 2 regions will start neutral, same for sudeste, where we have 2 sp.
One position is there just to have rounded numbers (the one in oeste) so we don't consider it.
The issue is when the assigned sp are those into a 3 regions bonus with a single position, so 3 of them; we will call them lucky sp.

So we can have different cases, that makes a bit tricky to calculate percentages, but if you think, for example to a 2 player game we can have 3 different situations
1. pl1 receive one of this lucky sp, but pl2 not
2. pl2 receive one of this lucky sp, but pl1 not
3. both players receive the lucky positions
Now think about the drop, 24 regions, the first position is given, there's 3 good out on 8 that could be a lucky sp (37,5%). If the first player is lucky , the second player has 2 on 7 (28,5%), if not the 2nd has 3 on 7 (42,8%). Looking at these percentages it's very frequent that at least one of the 2 players will receive 1 lucky sp
If one player will receive it, when the position are both given we have the reminder position that turns neutral, so 24-2sp-6n = 16
this 16 regions are divided among the 2 players + the neutral player
Now, if pl1 has received a lucky sp he need to receive the other 2 regions to start with the bonus, so we have 2 good regions on 16 (12,5%), if he receives the position, the next assigned region, assuming that the one left he needs is not given to someone else, will be 1 on 13 (7,69%), etc etc etc as said I'm not going to explain here all the mechanism.
If you're interested in understand how it works you can certainly find some info on the web.
Now, if my math is not wrong, if he starts with a lucky sp there's about a minimum of 8,33% that he can receive the other 2 he needs to start with the bonus.
Instead with 23 regions, to receive the 3 regions he needs to start with the bonus he has about a 2% that's much better.
Yeah, some games can have 1 player that will start with a bonus in any case but it's less than giving him an high percentage to receive one of those 3 lucky regions (sp) he needs from the start that will raise the overall percentage to start with the bonus.
So the issue are not the starting positions, but the fact that some 3 region bonuses have just one position into them with a so small amount of regions left in the final normal drop.
Not sure if it's clear what I've explained above and maybe we should test the two option on a longer period to understand which one is better, afterall when it comes to this type of things you can roll a dice for hours and never obtain a 6!
Statistics work well only on the long run.
Nobodies