Had some no-name with the correct rank pips shown up and claimed the right to command, it would have been an easy decision - better him than me, the skippers would think. But with Picard/Locutus, it's a choice between salvation by an expert Borg-fighter or assimilation in the hands of the most infamous traitor in recent history, except you can't really choose...
I wonder how many of those captains told their Tactical Officers to slave the weapons to commands from the Enterprise, and how many told them to clandestinely lock them onto her?
Timo Saloniemi
I wonder how many of those captains told their Tactical Officers to slave the weapons to commands from the Enterprise, and how many told them to clandestinely lock them onto her?
Timo Saloniemi

. Heck wouldnt it be better sent 2 or 3 cubes to assimilate Earth or just hold one cube at Federation border and if the Cubes fails their mission.

But, my personal interpretation, the Borg want technology as well as assimilating species. Earth in the 24th century is a greater prize than Earth in the 21st. So they send a cube to assimilate Earth, and only when that fails do they attempt time travel, a back up plan so they get something rather than nothing.