I play solo,duo, trio all the way up a six piece sometimes a bit more, all with an arranger keyboard. I guess I'm lucky I've never had problems with players following along, even with no in- ear monitors or click tracks. I love that the arranger allows me the flexibility to offer various configurations to fit the clients needs and budget.
And now for a "shameless plug": You can check out my "arranger keyboard centered band" on YouTube. Just follow the link below my signature.