ともなると - Grammar Discussion

when
if
as

Structure

  • Noun + / + ( ) なると / ( ) なれば
  • Verb[る] + ( ) なると / ( ) なれば

[AともなるとB, if condition A comes true, then surely B will happen・も emphasizes the expression]

[A is often a special occasion or means something significant to the speaker]

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uhh… something’s off here.
The orange nuance text is nowhere in the grammar page…

…but it’s on the discussion page?

普段は貪欲ではない人でも、莫大な金額 *ともなると * 貪欲になるかもしれない

Can someone help me understand why ときたら doesn’t work in this sentence or what separates them?