Are all previous firmware included with latest firmware for Mavic 2?

Yes, that is my understanding at least.

Hi there, for better user experience, we recommend customers to update the firmware to the latest in time. Should you encounter any issues, please feel free to let us know, we'll do our best to help you.

Replacing a firmware is always the total picture. It is not an update. It is an image which replaces everything to the latest version. No need to run thru all previous versions.

JohnDG Posted at 4-7 06:16
Replacing a firmware is always the total picture. It is not an update. It is an image which replaces everything to the latest version. No need to run thru all previous versions.

Thanks folks for replying...This was helpful on future updates (Images)

I read the DJI document for all firmware notes but nowhere did it say previous versions was included.

I asked because DJI Assistance 2 showed version .3, .4 & .5. and not version  .1 or .2.
I was thinking the latest would not include these two.  So I actual down graded to .3 then back up to .4 and .5 not really knowing if .1 and .2 was included.