60% of statistics are made up on the spot.
Do you honestly think it is as low as 5% when the average loner is two suited or sometimes three with ace, and X offsuit. Mathamatically it is more probable for someone to go alone with this than three trump and two aces. That hand doesn't come up as often. I can create more scenarios like this, its not just a miracle hand.
If you lead your diamond first then you are forcing yourself to choose between the ace and the only double offsuit you have. Almost all of the time people have two offsuit cards of the same suit in a loner. If you are four suited or three with no trump, and you have one offsuit with two cards, and one single ace you ALWAYS lead your ace. This saves your offsuit for the end, and it doesn't make you choose between suits at the end. You don't want to screw yourself and throw away the stopper if you had it. Leading anything other than the ace forces you to choose, or gives the trump maker a chance to play low. If you had a partner that can read your cards, he/she would see your 9 of clubs on the 4th trick and know you have another club. This does get your partner involved, if they have no hearts and one trump they can trump high hoping to force the right to overtrump them, or then they watch your 9 and 10 go and know you dont have any more, common sense would say that because why? Think about it....
When you defend a loner, or play any hand out for that matter, put yourself in the other persons spot. Based on what cards you have and the cards you see being played, what else could be in their hand? When you have a good idea of what is in the opponents hand then you always have a slight advantage over your opposition. This creates the natural phenomonon known as "Todd Cards."
Daruka - You got the first two guys right, but the rest of those guys in that list block like crazy. If you lead your diamond first then you are forcing yourself to choose between a club and a heart, why? If you lead ace first then you keep your double suit, and a smart partner will see this once you play the 9 on the fourth trick and play accordingly. The first lead is the most powerful tool against a loner. If you ALWAYS play a certain way then people are going to pick up on it and use it to their advantage.
Since I almost never block, I have had the opportunity to study every loner that was called on me and figure out what was a stopper (if any). We can say we wouldnt lead the 9, but I've watched countless people do it, myself included. I can send you the text file of the log in the game you recently did it in Garry, if you'd like.
We can debate for countless hours, but in the end really the only thing that tells the truth is numbers.
If you guys don't believe me then hey I can't force you to have an open mind and to stop playing a set way. Just stop complaining about the amount of loners being made when you could have stopped it by leading your single ace once in a while.