Why would he alert Jeremy? If he was at WHF when Jeremy arrived with the police, how did he get out without being seen and unlocking any doors or windows? It wasn't his house so if there was such a way in or out, he's unlikely to know but then he has to get passed the police. Why wouldn't he have just killed them all when they were all present? Nah - far fetched!
He alerted Jeremy to get him to the farm - he needed to kill him too - or no money for Anthony ...
Anthony knew where the spare key was kept and knew the farm as well as Jeremy did - Anthony grew up there ...
Anthony would have been as capable of entering and leaving the property as Jeremy was.
He might have been seen 3 times :
1) movement in the window
2) gun in the window (WPC Jeaves statement)
3) hunched up man seen leaving area by Police - Police statement at press conference ...
And he had no opportunity to kill them why they were all present - in the daytime there was too many other people potentially visiting or working at the farm - it had to be night time and it had to be that weekend while Sheila was visiting - it was his only opportunity ...
Why exactly is it far fetched ?
Just because you have a pre conceived notion of Anthony or have never considered this possibility before does not make it far fetched ...
Anthony losing his parents at an early age might have given him serious mental problems.
He liked shooting animals.
He maybe resented the adopted Jeremy and Sheila inheriting what he felt was his rightful inheritance ...
He ended up with a substatial part of the money ...
Why is it far fetched ?
On what logical basis ?