If that were the case, then Yu Siqiao must have already sent people deep into the Mo Family.
The Mo Family isn't small—if Yu Siqiao or Yu Jinggang had such intentions, and they planned to engulf the entire Mo Family within a few years, they would have had to start planning several years prior.
Otherwise, it's impossible that in just a few years, the entire Mo Family conglomerate could be ruined and swallowed.
From Yu Siqiao's current attitude, however, this possibility does not seem likely.
There's another explanation...
Before Yu Siqiao had invaded the Mo Family, the senior executives within the Mo Family had already seen Elder Mo aging, Mo Jiantao being useless, and Mo Shu unable to shoulder the burden, so they started plotting to erode the family from within.
Yu Siqiao then took the opportunity to enter the fray, played the fisherman, and ended up as the ultimate winner.
