1)
What is "Shalisho"?
1.
Rashi: It is his Gibor.
2)
What are "Es Argov v'Es ha'Aryeh"?
1.
Rashi: They are an esteemed palace and a gold lion [in his palace].
2.
Radak: They are the names of two Giborim. Pekach ben Remalyahu came with them and 50 others.
3.
Malbim: Argov is the name of a Gibor. There was also a lion trained to attack anyone who entered without permission.
3)
With whom were the 50 men?
1.
Radak, Malbim #2: They were with Pekach ben Remalyahu.
2.
Malbim #1: They were with Pekachyah.