Generally speaking, what I have seen differs between MUTLIPLE rolling circles with an without rudder is this:

The ones with rudder tend to be tighter turns and slower, whislt the ones without are more larger and flown faster because you need to kick up the speed a notch to keep the airplane going.

I can understand what Uby is saying here when it come to rolling harrier circles, I know some planes do "lock" into a harrier which could be such an explantion. Whilst rotating especially with a high spped of roll, the time spent on the side of the airplane would be minimal now Im no expert here, but if the plane is rolling like mad elevator and alieron can be used to keep a near straight path and possibly to perform a decent rolling cirlce of either the standard or harrier.

Also some of here say it is possible or is isnt, but do we all fly the EXACT same airplane?

I there some planes which take a hell lot ot KE and some that dont even need a breath of rudder, That is one factor which must be taken into account, also if Uby here is using a Positron 90 I have heard that can KE nearly wihout rudder or very little.

No-one disputes that rudder can be ommited with certains airplanes to perform the manuver, but the question remains gentlemen and women. Can it done to a certain perfect standard. But even then, the meaning of "perfect" is different to everybody.

I'll leave it here till the video is to be seen

Shahid