"Anonymous. So you beleive that judges should judge there own pupils."
I don't believe it is ideal, but banning it would mean either that the best available experts are not available as judges, or are not available as teachers. There's already nowhere near enough true experts to fill the world demand for either coaching or judging work, and most serious competitors would not be willing to accept second rate in either category!
"Let me tell you what once happend to me.With the past record I should have been placed 3rd. Two judges were so intent on marking their pupils 1 st and marking their main opposition as low as possible. What happened was I came first."
The skating system of marking makes such simple explanation unworkable. You would need high marks from a majority of judges get first place - it can't be just the two you cite, at least half the panel must be involved.
What can happen to elevate a mediocre couple is where there is widespread disagreement amongst all the judges over all the couples. Then someone who is universally seen as neither particularly outstanding nor particularly offensive can win. But this generally happens when you have either very sloppy dancers with a lot to object to, or inexpert judges who are looking for their whims rather than anything comprehensive.
Have you considered what would happen in a competition with six couples and three judges.
Running a serious competition with three judges is almost unheard of. If it occurs as a result of economic or scheduling reality, everyone realizes that the result are a bit dubious.
"When one of the speakers said. We have all been in the situation where the organizer of the competition has told us in no uncertain manner who the winners should be."
And having judges who don't teach is going to protect against this how? If anything, having teaching income should make them more resistant to alleged manipulation by a competition employer.
"What do you say to that one.If this is to become an Olympic Sport"
Along with most who are serious about dancing, I rather hope that our artform is never abused as an Olympic "sport" You will find that most of the olympic dreamers in the dance world are either low level dancers who think the idea is fun with contemplating how much damage it will cause, or IDSF bureaucrats who see it as a way to solidify their power.