Isaako has copped major flack for his defence but he was often a victim of his inside defender's poor reads a lot. I am definitely not saying he is without blame, he did make poor decisions too.
However Turpin constantly jammed in, as did staggs and this left isaako alone, often marking 2 or 3 blokes. If he stuck on his wing when out numbered, the try would just be scored by a centre and an easier kick at goal.
The right side (and isaako's) defence was a lot better when dearden was out there who read the attack better than turpin and stuck on his man, allowing isaako to stay on his wing.
I think isaako will come good, yes it was a poor year for him but he trains hard and he will improve. If he practices catching highballs and reading plays with the same dedication he does with his kicking, I think he could develop into a good fullback, he may not have the best ball skills at the moment but he is agile, quicker than he appears and supporting our big forwards, he could do some real damage.