We did a group this size in September 2019. Normally I would have called the group number for restaurants because normally we haven’t split into smaller groups during the day.
When touring together we arrive together to restaurants and have usually been seated together at one table.
With the September group I was fairly certain we’d be touring separately and thus had a good chance of arriving separately.
I also expected some in the group to bail on ADRs completely, possibly requiring some musical tables adjusting so some weren’t sitting solo.
Because of the arriving separately or not at all, I decided to make multiple ADRs in groups of either 3 or 5, and possibly one 7. I used 4 different credit cards to make the ADRs. Two borrowed and mine and DH’s.
I did have to call for one restaurant’s ADRs and the CM made two separate ADRs in my name with my credit card. Only a portion of our big group were eating at this meal.
While at WDW the plan worked great. We did have folks bail. We were able to move folks around because of the extra seating available with the odd number reservations.
We did have some show later than others - the early ones didn’t have to wait to be seated.
Occasionally we were all seated together at the same table. The times we weren’t, we were seated at adjoining tables which was perfectly fine.
This was obviously a lot of preliminary work. It paid off in smooth meal times.
If I were fairly sure we’d tour together, or very confident in folks’ ability to be on time and on schedule, I’d call group dining.