Yes,Souei-sama is too cool.
*insert fangirl scream*ლ(´ڡ`ლ)
IKR!! *INSERT PLUS HEAVY BREATHING* If only Souei-sama notice me...
No, the king did not come by himself but he didn't come with many people either (He came with Bester). He was also riding a pegasus when he arrived. And they did spar as well. So far, the manga is still following the plot of the webnovel. Some minor details have just been changed. (Source: I also read the webnovel. I have the 7 fan translated ebook volumes. This specific chapter is Ch46 of Vol 3.)
Meh don't wanna spoil but read at your own risk
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The manga clearly is so different with the Web novel right now, there The king just came by himself and talked with Rimuru about forming an alliance with them. And there is no pegasus thing in that story as far as i have read lol but they did spar. BUT hakurou isn't the sword something to the king. im currently at 120+ chapters so maybe there is a possibility that what im saying is not true or could be true.
PS.
THE NEXT CHAPTERS OF THE MANGA WOULD BE TOO GOOD! LOOK FORWARD TO IT~
PPS.
SOUEI-SAMA IS TOO COOL!!!