Rooster/Sagittarius and Rat/Scorpio sit at 65-70%, a cross pairing of the constitutionally honest and the cheerfully strategic. One cannot tell a lie that sounds like a lie; the other could sell the lie back to its author.
Rat/Scorpio is magnetic, direct about its terms, and always out for number one; Rooster/Sagittarius is a bundle of incurable optimism whose honesty even adversaries value. Oddly, they respect each other fast: the Rat can trust what the Rooster says, and the Rooster admires a competitor who makes no secret of what is in the deal.
Blunt meets blunt, refreshing until the Rat's razor-sharp wit and acid tongue collide with the Rooster's tactless truth-telling. Neither means all the damage done. The white lie the Rooster should learn and the mercy the Rat should practice are the same skill.
The Rat's rampant suspicions are the deep fault line: it cannot quite believe anyone is as honest as this Rooster actually is. Meanwhile the Rooster's charity toward every hard-luck case strikes the pragmatic Rat as exploitable softness.
Rat/Scorpio finally learns to trust a partner, the lesson its stress-prone health depends on, because this one genuinely cannot deceive. Rooster/Sagittarius learns discernment in its giving from the sharpest judge of motives around.
At 65-70%, Rooster/Sagittarius and Rat/Scorpio are workable with effort: honesty and strategy under one roof. Trust, once the Rat grants it, changes everything.