Very suspicious:
Toro Rosso had not a single problem related to the engine and completed many laps so far.
McLaren only had problems so far with the 'highlight' of the need to change the engine today.

Very hypothetical but maybe McLaren could have contributed to the problems (for Honda) by far more than what we've heard or read here and there in the last years.
Franz Tost on the other hand is very happy with Honda. It looks as both parties can benefit.