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I would do the grounds all together.
Breaking the grounds up in groups runs a risk of the jumper being broken or disconnected.
A blue wire nut is good for 6 - 14 gauge wires.
There is no more risk of a jumper breaking than there is of any of the EGCs breaking. The EGCs often break inside insulation or inside wire nuts. Either is rather hard to spot until after the devices are installed and a circuit tester is applied.

An easy but seldom used way to connect multiple Equipment Grounding Conductors in a large electrical box is to install a small add on EGC busbar in the box. Some of the smaller accessory busbars that are made for installation in panel cabinets and other equipment enclosures are also listed for use in electrical boxes. A metal box must be thick enough to engage 2 full threads of the mounting screw or screws. At 32 threads per inch that only takes a 16th of an inch of wall thickness. Most electrical boxes are thicker walled than that.
I have a 4 gang box plastic and a need to connect 10, 14 awg ground wires.
With a plastic box such as the Discussion Starter has it only needs to be fastened in place. Since many of of those busbars are listed for 3 EGCs in each terminal the shortest ones commonly sold are more than enough for the use. Using a busbar for the EGCs makes an elegant and professional looking installation.

Tom Horne
 
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