Hey 99ESMAX. Welcome to this wonderful forum. Many times the best answer is to simply try it on your own to get your own opinions and experiences. It's not unusual for different members to get slightly different results. This is going to happen and always will.
With that said, it would probably be a good idea to use some 3M SMR after the 3M Finesse It 2 IF you notice some vertical or horizontal light swirls. The SMR will help out immensely in that aspect in addition to any possible hazing. Then follow with the All in One. The All in One, by itself, may not be the perfect product to help minimize the tiny left over horizontal or vertical swirls that may still exist. This is where the SMR will come in handy.
But again, the best judge of anything will always be yourself. There is nothing wrong with experimenting a liitle with these products. When I say experiment, I mean that if you want, try the All in One after the 3M Finesse IT 2 on a small area. If you gives you the results that you want then just do that. Experimenting is part of what makes detailing so enjoyable. Laters