Hiyama vs Sonogashira coupling

Why is Sonogashira's coupling more feasible than Hiyama's coupling when both could occur? I have seen many examples in syntheses, here is one (the penultimate reaction): 
[![http://www.chem.wisc.edu/areas/reich/syntheses/histrionicotoxin-stork.gif](https://i.stack.imgur.com/jHZpH.gif)](https://i.stack.imgur.com/jHZpH.gif)




So I will answer my question. In [Organic Chemistry Portal](http://www.organic-chemistry.org/namedreactions/hiyama-coupling.shtm) it is written that Hiyama coulping requires an activating agent such as fluoride ion or a base because crucial for the success of the Hiyama Coupling is the polarization of the Si-C bond. Activation of the silane with base or fluoride ions (TASF, TBAF) leading to a pentavalent silicon compound is a first necessary step. The whole mechanism is given here:
[![enter image description here](https://i.stack.imgur.com/MwzXl.gif)](https://i.stack.imgur.com/MwzXl.gif)


On the other hand, Sonogashira coupling doesn't require any activation and it happens preferentially in the above mentioned synthesis.


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