Well... you have a LOT to learn.. So you know,, I am a Fellow in 2 english soc. in BR and latin. I also was an examiner with the NADTA. States-side for 30 yrs.
1st.. You need to know the roots of Rumba. What you call Rumba today ( Intern style ) is a re-make of Bolero and a Mambo basic. The original dance we called Rumba, was a Danzon, and THATS what we danced in the UK thru 1948/9, when the change was made, to todays format. And yes, it did commence on a fwd slow (1.2 ).
The english versions of " latin ", in many cases, do not resemble anything comparable, to the social style of latin taught and danced in the States. They have stayed much closer to indigenous roots, and , made it socially acceptable, to the general public. And ,the Cuban Motion is patterned ,after cuban ladies, from the way they walked( WITH a flexed knee ,to straight leg, causing lateral motion )carrying baskets upon their head. Islanders, always move with a " sway " au natural..
And... Do you not realise that, ALL the dances in our Syl. came from somewhere else ?. They are hybrids at best.
Both AM and F.A. met a need in the 30s and 40s, and there were multitudes of great teachers and dancers who developed social dance to what it is today ( I met and got to know many of them ).
And by the way Fred couldnt dance B/ room worth a lick ( his words )
Yep.. we had our dance geniouses, Scrivener, Binnick, Thiebault, Howard ,and Jacques .Their input, was geared much more towards the competitive arena, and Medal test standards.
Bottom line,there are bad and good schools/studios and same goes for teachers.Its universal...