when playing Single Draft, you can't see all options that your allies have. I usually type into chat which three heroes i have and with which i feel comfortable. Sometimes, others do the same, but at least 2 allies don't chat at all during the pick stage. This bugs me since often we end up with a weird line up. Not always with a bad one, but weird.

I'd suggest that you can see in the top under your allies the icons of the three heroes that are their option, sorted by STR/AGI/INT. For SD you don't need as much of the picking GUI, since you yourself only have three heroes as your choice.