One of my "win the lotto" dreams is to make a marine company that's mostly bikes-namely the White Scars 8th as 6 bikes squads, then 3 assault squads. But then I got thinking, could you do an all bike army per Codex: Space Marine? My hang up comes with the rule for marine captain on bike, namely "bike squads with 5 or more models may be taken as troops." Does this mean:
1) I can take 9 squads of 5+ bikes, but only 6 count as scoring units (i.e. troops)
or
2) I can only take 6 bike squads because when I add the captain, bike squads become troops
or
3) Something I haven't thought of.