hey sal, sorry im in china and cant watch youtube here unfortunetly but the rou quan er lu I learnt is from the Shi su xi linange. to describe it, i would have to say it has a lot of similar and same movements to pao quan (the one that the old monk preforms on the golf course) however is a lot longer with more defensive movements and silk reeling.
I also recall hearing something interesting a long time ago which i dont know if is true? but was something along the lines of xin yi ba was developed from rou quan, hong quan and pao quan and if you study these 3 systems all the xin yi ba movements can be found? has anyone else heard this? which could mean in theory if you study rou, hong and pao quan forms you may well know some xin yi ba and not realize it depending on your understanding of the movements.