There are multiple 'keystones'

A keystone is:

• The stone of an arch (typically the uppermost stone), which, being the last put in, is regarded as keying or locking the whole structure together; the stone at the apex of an arch.
• Hence A supporting principle; the chief element in a system; that upon which the remainder rests or depends.
• In chromolithography, the first stone on which the picture is drawn or photographed, to serve as an outline guide in preparing the other stones for the colors, a copy of the keystone being made on each stone for printing a single color. See lithography.

Rachel Chandler is the keystone to pedogate

Israel is the keystone to geopolitics

The Senior Executive Service (SES) is the keystone to the American "deep state"

Mil Intel, No Such Agency + POTUS + Patriots = the keystone to "The Plan To Save The World"

and there are likely more

There are multiple 'keystones'

A keystone is:

• The stone of an arch (typically the uppermost stone), which, being the last put in, is regarded as keying or locking the whole structure together; the stone at the apex of an arch.
• Hence A supporting principle; the chief element in a system; that upon which the remainder rests or depends.
• In chromolithography, the first stone on which the picture is drawn or photographed, to serve as an outline guide in preparing the other stones for the colors, a copy of the keystone being made on each stone for printing a single color. See lithography.

Rachel Chandler is the keystone to pedogate

Israel is the keystone to geopolitics

The Senior Executive Service (SES) is the keystone to the American "deep state"

No Such Agency + POTUS + Patriots = the keystone to "The Plan To Save The World"

and there are likely more