There is nothing going around the local pike anglers/club that would indicate a Piker has put Pike in there.
Besides being pointless as permission would not be given to fish the place anyway, the local pikers are working together to try and stop this sort of thing.
There has been plenty of illegal fish movement in the past few years thanks to various reasons which I will not go into, but as i said before, the local Pike anglers are just as concerned as others are.
Having said all that, without a photo or body of a Pike, I would withhold judgement on this story. So so many times I have been told that Pike are in a water because someone had been told so, or a big fish was hooked and lost so it must have been a PIke.
For someone to dead bait such a vast water, actually find a Pike that is feeding, and for that pike to take the bait (deadbaits are a poor bait in a trout water) and then for that fish to be lost all seems a little dubious..in a nice way that is.
A true story now...when Shell had Haddo back in the 80's I joined the Pecten Angling Club so I could fish it. The reason was because I was told that a few pike had been hooked but lost on the fly. I was a club member for 7 years, yet in that time no pike were caught or reported...yet I still heard the same stories. Anyone seen a Pike in Haddo? Thought not. I still put the tales of powerful fish being hooked down to eels, which it had in numbers back then, or a large Brownie.
If I hear anything rest assured I would make sure the proper authorities are informed.