They might be in awe. Gallantmon is a very powerful and majestic digimon. They would probably be a bit intimidated at first, just looking at his large and imposing form.
One idea could be that the Digidestined are in a dire situation in the Digital World and Gallantmon appears as an unexpected savior. He then decides to guide them on a quest to find a powerful artifact that can restore balance to the Digital World.
Well, there are several reasons. Maybe it's to convey a sense of loss or sadness, or to show growth and change in a character. Also, it can be a way to make the story more dramatic and engaging for the viewers.
Manga Rock is closing maybe because it violated the rights of manga creators and publishers. Such violations often result in forced closures to protect the interests of the original content providers.
Black and white sister cartoons often have a classic and timeless look. They might focus on strong lines and simple shading to convey emotions and expressions.
In a cartoon, a baby grand piano might be drawn with big, shiny keys and a beautifully decorated body. It could have a colorful finish and maybe some cute musical notes floating around it.