Elastic effect won't hit his skills, but cross training will. He has three Atrociouses and two Awfuls. This means that whenever cross training hits one of those five skills, you will lose some of your traning on primary trained skill and compansate on cross-trained skill. This is just a rough estimation, but whenever cross trianing hits an atrocious, you will probably lose 15% of training on primary trained skill.
This could be offset by training these low skills first, but you will lose more this way. So it's better to just suck it up and hope cross-training doesn't hit those five low skills too often.