Roger just wanted to avoid casualties, his military power at the time is easily superior to Big Mom's gang, if we assume that it had the same current dynamic, where its crew members are his children.

At the time Roger stole his Poneglyph his children were either very young or not yet born. Rayleigh was at least strong enough to pose real danger to Teach Yonko, given both characters' statements.

In One Piece a single outlier character can decimate entire armies, ignoring the difference in numbers.

What resources did Big Mom have to counter this?

Considering that she would probably come into direct confrontation with Roger.

If you imagine a conflict scenario, where the Roger pirates can exercise their notion of power unhindered, an indisputable victory will be evident.
All that is copium
 
nah. He used it in conjunction to his Boar Roar. We haven't really seen something like that. It's basically acoc.

And goofy got melted by it too.

He may not have Shanks level coc and acoc, but he's pretty elite.
BM CoC was mixed with her scream which blew things and people away
We've seen this before, it is just that Topman roar is much louder and stronger
 
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