Getting back on the subject of Whitebeard's crew
If you notice, Whitebeard has two different jolly rogers. There is the skull and crossbones seen on commander Ace, and the flag itself. While some of the veterans; Marco, Atomos, Jozu, and some of the older commanders in panel during the intial sieze hold the "crecent moon shaped like the titular pirates 'stache"
I present this theory, we know that age means about jack diddely in the one piece world. (i.e. Kureha is admittedly 100+ years old and still has an athletic figure, Shakky being retired from pirating for 40 years and still looking milfish in her 30's, and lets not get started on Aokiji not aging a day in 20 years)
So I'm saying, we take Marco and Jozu, the 1st and 3rd division captains/commanders sporting what i believe to be the "throwback" Whitebeard isignia. You only see this on the older guys on the ship mostly. Now i admit, in panel you see some of the "youngsters" sporting the throwback, but I'll chalk that up to some guys wanting that cause it looks cooler.
I believe Marco, Jozu, Atamos, and alot of the older commanders and crew have been with whitebeard for a while, and since Teach himself stated he spent "decades" on Whitebeards ship, I can imagine 'ol Whitebeards been in the game for a minute. Roger too, maybe he didn't start his grand voyage 'till he knew he would die--a final hurrah if you will.
I know i offered very little physical evidence, and presented it only by reference and i apologize to my detratctors and anyone who agrees by not validating this more, but its 10:44pm and I'm a lil tired.
thanks for reading