BoyBrumby
Englishman
Surely an SLA bowler could bowl a doosra? Whatever you might like to call it, the delivery would just be the mirror image of an off-spinner's version. Pretty sure Panesar has spoken about practicing one in the nets at least. Chinamen bowlers' wrong 'uns are called just that, so I guess their orthodox brethren's ball that goes the other way might just as welll be called a doosra.Two of them being left armers and hence cannot bowl the doosra. The third one's presence denotes absence of cricket played by the usual suspects and the general deficiency of solid off spinners of late.
Regardless, my point still stands, it is possible for finger spinners to make a go of things without the delivery.