Outapokit Hi. Good name by the way, though hopefully not entirely accurate
I think you are in a syndicate, not a sole purchaser. So if the syndicate is looking to buy you out that is completely unrelated to any bank guarantee (pretty worthless thing in reality as you risk more to excercise it than you will ever get back) and so you have get out options not open to individual purchasers. So its a choice for you to make, get your dosh back now and move on, and let the syndicate take the profits later, or stick with it yourself.
A property syndicate would not normally offer to buy out its memebr to absorb your losses, they do so to get you out of the medium to long term picture in order to maximise their profit, but its a personal choice for you to make depending on your individual circumstances. Only my personal view, but if you are looking for short term profit on property, Andalucia is no longer the place to look for it.
But if you are already in there and can afford to wait, why sell out to those who are prepared to put their money where their mouth is and bear with it in the belief things will bouce back and they will scoop up your profit later?