I would think it would be a good time. Easter is April 12 this year so he would miss a lot of that crowd. If he is staying on site, he will have FOTL anyway, so when he visits won't be too much of an issue crowd wise.
Mardi Gras is going on at that time as well. Should be busy spring break also takes place in certain areas at this time. I consider Mardi Gras a huge Pro! Its a lot of fun! Have them consider staying on site the resorts are incredible and the perks add to it. The weather was gorgeous when we were there in March.