A while back, there were exploits with KGW's  code ( probabaly 4 months or so ), where durring a fork ( intentional change to the block chain for w/e reason ie. hot fixes sort of thing ), the block chain could be attacked. Altho not fond of the person, I believe BCX ( a known person in the alt coin world ), did this when AUR coin did their fork. From that time forward, I dont believe many have been using the KGW code , in its origional form, I have seen coins refer to 'their' version of KGW as somthing to the effect of 'updated' or 'revised' or some way of explaining that it is not the original code.

Considering you can never be too cautious , one should anticipate that down the road, there is the possibility of forking the chain , to update, change, alter, improve. Not considering this would be an unwise , and highly unlikely scenario unless the con dev(s) only plan to make yet, another coin to 'have their way with'.

If I could point you to an exact example I would, however, perhaps a forum search or google search , will provide more indepth information.