The Ottomans would really spice up the gameplay but I guess it makes more sense to start with Prussia or Russia
Pretty sure Pliskin was meaning it'd spice it up since there'd be a drastically different faction in terms of uniform and music, rather than another European army. I do agree however that the the major fighters in the Napoleonic Wars should be added first, then minor nations like the Confederation of the Rhine, and last additional nations that either didn't fight, or were out of the fight at that point in time. Like United States (war of 1812), Ottoman Empire, Persia (historical rival to the Ottomans) and, Qing (Last one prob isn't going to be added to be honest)
It's pretty obvious that Spain will most likely get added next if this poll is anything to go by.