Chunyu Kun, a native of Qi, offered a persuasion that the king of Wei should join the Vertical Alliance in opposition to Qin. Because the king of Wei considered his argument subtle, he gave him ten chariots for a mission to Chu. As Chunyu Kun was taking his leave, he offered a persuasion that the king of Wei should join the Horizontal Axis with Qin, so the king of Wei canceled his mission. He failed not only in getting the ruler to join the Vertical Alliance, but also in having him join the Horizontal Axis. He would have been better off with fewer abilities and no eloquence at all.
On the Zhou tripods there is pictured the ancient artisan Chui chewing on his own fingers. By this means did the ancient kings illustrate the uselessness of excessive skill.
Id., 18/4.6

To honestly and adequatey advise the king facing an alternative, the counsellor must, in principle, to be clear about the pro and contra of each possible choice. Exposing both is not contradictory.
He has also to be clear about the advice he gives to the king.
Then he is supposed to persuade the king that this solution he recommends is the better one.
To persuade somebody of something, the most comfortable place for the counsellor is to exhibit some involvement in with it, that is to identify with the case, and exhibit the corresponding ethos.
In any case, the king has to ratify and reinvindicate the proposed solution.

Chunyu Kun possibly did something like that, that is, convincingly recommended one, then the other solution.
The king is disoriented. Both advice are unexploitable by the king.
Chunyu Kun plays with the king’s, possibly because he wants to expose the lack of capacity of the king.  thinks that the king has no capacity to choose.

In this case, his speech  must underline the strengh and weaknesses of each solution.
A counsellor can honestly  blame and reject one possibility and recommend the other.