yes oracle only increase radius at which distance u see emporia, it think max upgrade double radius so it quadruples area
not confirmed but I think u can have all missions available at same time, I have at least 4, +24regular positions
every day u receive +12 positions, if u use them or not they are there waiting for you.
for example if u haven't played Persians in long time and have 24positions and u kill all 24, 12 will be replaced so u can kill another 12 if u like total of 36 per first day.
2nd day u start with zero + 12 new for day, total 12 u can do.
so 12 per day is always awarded, you might not see them directly as they might be waiting in que if u already have 24, that's was my point:)
this is not good way to do it, regarding payouts etc, specially on higher levels, but u can advance by 12levesl per day, if u wish so.
Just kill highest position only, 12 position of same type for example 12 offensive = 12 new levels
and again for first day u can double it with another 12, since these 12 killed will be replaced by 12, so for first day is possible to go 24levels up, then if u don't touch other type in my example u don't touch def only do off, then any additional day you will get 12 new positions, red ones so uc an advance another 12 levels per day.
But ofc that's not what you should do:)
99% of people don't play positions almost at all, only very rarely. just some small hits during tourneys, some players avoid them all together.
regarding of all changes about positions and that fact u read old info from 2015, that info still applies, but rather than getting positions to 1 bar and then cash out reward, which u can still do no problem, u can safely kill positions get small partial reward and u should know if track resources when big payout come, more or less.
all in all not much changed, just if u killed position before and there wasn't big payout, there was nothing, this time u get some small troops, they eat out of your big payout, but in the end same thing