This is the standard out of character discussion thread.

Just as an aside, I didn't like the character sheet template I found on the site, way too complicated.  Just make sure the information that's important is on the sheet here:  Combat stats (DB, OBs, etc.) skill in which you have ranks with # of ranks and totals; Stats with base, adjustments, and total bonus; things gained from background options; and any gear.

Can we allocate Stats after we rolled the potentials?

To do that you need to record the die roll that determined that potential, so that if you replace the stat with 90 the new potential is determined based off the original die roll.

Of course.
E.g. you roll 23 as temporary and 77 for its potential.
Thus the Pot would be 72.
Then you replace the Temp with 90... 90(77)...
I suggest to rather use the raw Pot Roll, the 77, and apply it to 90 in the table to get 90(90).
Unless one were to generate a high Pot on a low Temp and suddenly decide to start with e.g. a Ranger with CO 58(95) and thus keep the 23(72), the lowest Temp roll of your 6 rolls, for another Stat.