First Post - so be kind please

I've now resolved in my own head how The Doctor at the end of the The Almost People says something like - your've not invited to my death this time - Amy tells who she thinks is the Ganger Doctor

But.....

The Ganger Doctor destroys Jen with the Sonic Screwdriver, how then does The Doctor destroy Ganger Amy with the same Sonic Screwdriver?

He doesn't. We've already seen the TARDIS create a new sonic in the eleventh hour so I guess she just made him a new one when he got in.

The ganger will have been created with one in it's pocket, because the Doctor had his screwdriver when he was initially scanned by the pool of Flesh. The Flesh will have just copied literally what it scanned, not specifically isoliating the body of the person hence why they come out clothed.

One of the screwdrivers therefore is a very functional and identical Flesh copy - and because it was part of the Ganger that formed it contains the code needed to construct a full Doctor ganger just as the Doctor's hand contained the data needed to regrow a body.

At one point, the Doctor switched the real sonic with the copy (perhaps before we realised the Doctors themselves had really traded places).

The clone Doctor that was turned to goop at the end had the real screwdriver as that one fell to the floor instead of being reduced to goop itself. The other sonic was only used after it had been inside the TARDIS - which caused it's 'matrix' to solidify (hence the gangers stabilising) which is why it also didn't get reduced to gloop when it was used.

The ganger Amy wasn't a true independant ganger, just an avatar that was linked to the real one in captivity somewhere, all the Doctor did was sever the link and the Flesh went splat on the TARDIS floor.

Don't forget... the Doctor did refer to the sonic screwdriver and 'molecular memory' before he left his ganger to sacrifice himself. The two Doctors (being the same person) both came up with a way to save the ganger without the ganger Amy realising it (the Doctor doesn't know who else is watching) so that the ganger can be used at a later point to deceive the lone Silent on the hill into thinking he had died.

Also, there was a throwaway line that suggested that the Flesh have evolved to a point where it can grow and develop on it's own - we never saw that realised so that's got to be referring to the fact that at a future point the sonic will have grown and 'regenerated' Flesh enough to get himself a full body back