I don't believe so, Bach seems to have a huge affinity towards camaraderie amongst his subordinates so it would stand to reason his elite guard would have much time spent with one another and thus have a full understanding of eachothers powers and formations and strategies built around them. Also the elite guard has some info on ichibe whereas ichibe knows nothing about them at all.
If they all start in base, then yes he solos. If they're at their strongest forms, then I believe he can beat them all individually, but he'd lost to them if they work together (mainly cuz of Lille and Askin).
Well think about this for a second, technically they all got taken out by nimaiya oestsu. But got revived by juha. Plus ichibei literally has the power to take their power.