Knowing that VB-8 used black side numbers and the obvious evidence of VS-8 using white, it is a good guess, GUESS, that VS-6 also used white, but the double LSO stripe was an EAG practice, HAG typically used a single stripe. Gotta love the toe marks on the side of that SBD.
Of course in the YAG, "Scouting Five," since it was really VB-5, sported black side number with the letter B, but unlike EAG, they were aft of the national insignia. VB-3 also used black for its side numbers, but they were forward of the insignia as in the VB-6 practice. I don't see consistent use of LSO stripes in either the SAG and the YAG. I think, think, I see a single stripe version in one shot of a VT-3 TBDs (hard to tell, it's a bad angle in the shade of a covered revetment, circa late May 1942), but I can't make it out at all in an in-flight shot of a VT-3 TBD on 4 June and I don't see any LSO stripes in the available photos of VB-3 or VB-5 SBDs, nor the VF-3 F4F's. I've not run across any photos that I can positively identify as VS-6 at Midway.