What do hellions bring to the table
s4 cc atacks and poison shooting
In assult they have a decent atack stat, but lack armour and other saves. Yes they are wyches on skybords, no they dont have a dodge save. And at range they get eaten by bolterfire, wwith no save whatsoever.
And ther shooting is not as good as splinter avible anywhere else in the codex.
Now how do you suprise alpha strike with them? deepstrike or run forwards and shoot? Point for point ther shooting will not impress, and if the are within charge range, they are within bolter range.....
The baron does however ad a thing or two, if you whant to feld hellions, consider the baron for a hq.