They could be autosexing in that sense but there will be a lot of variety still. I would take the best barred boy cross them back to laced females to get complete lacing and then breed back the offspring to each other.
If you check out the calculator there are a lot of varieties that could come out of it, but also a lot of chicks to be hatched. Depends on what you are looking for though the laced Wybars the trick is the lacing and avoiding the incomplete lacing where possible. But like the Golden Cuckoo Maran it is autosexing based on chick down males are lighter (double barring) and males darker (single barring) on the E^R, eb works the same way.
It all really depends on the make up of that roo. I would really try to find out as much as I could about him.
Being barred and a Wyandotte would have saved me a my first cross and I would likely have pure Wybars by now, instead waiting for spring for some pures to hatch and another year before they lay.