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Best clip is those without ear to hold it in. Not so big chance they are altered in shape and tension before they sit correct. I have several pistons like this here and I found the tells of excessive heat on all of them. I still think bearing failed and heat caused the piston to expand, setting...

There is lots of things that can happen. If you see lots of saws you come across a lot of strange things. It is very hard to say for sure even if you have the saw in front of you. I see the pic, but it doesn't help much. The markings I can see in the port area is not enough to crack the piston...

Lost Clip will set the pin free. It can go out and snag the port, but there usually is a lot of damage done prior the snag. Mostly they stop and wonder what happened before it go in to port. If so it is very easy to see were pin traveled and hit. There is no way only a clip can do this damage...

The bearing can lock and be free again as it cools and pin return to shape. Pull in it and it gets oil on it too, but it does not mean much... A clip can not cause the piston to break like this, even if you place it above piston and do your best. Piston is softer, especially when hot and it...

Gas ages faster than you think. This is very common. Dump the old in with new and out the door they go. If you have half a tank and yours start as his didn't on gas bought in same place, say very little unless you stand beside him and fill your can at the same time. Storage is another thing...

The wrist pin locked up and broke piston setting clip free. These cracks in piston only happen when the wrist pin is stuck. So why do they get stuck? 99% of the time bearing fail from lack of lubrication. This create heat and it swells from center out. Finally breaking the sides of piston pin...