@weebdonny From my perspective, if it's reasonable for Bungo to go through a huge growth spurt in the 1st year, then it's entirely reasonable for Eita to undergo similar growth in the 2nd year. It is unnatural to be able to go from pitching at a wall with his wrong hand to striking out one of the best U-14 batters in ~3 months, as Bungo did iirc. So in the realm of realism, it kinda makes sense that Bungo didn't grow at that velocity through the rest of the yrs. I'm still disappointed he didn't, but it's a choice by the mangaka which I can respect.
That said, I definitely think the massive change for Eita, both in terms of skill and personality, could've been at least hinted at better. Right now it just hits like a brick wall, and his reasons for being good in 1st yr fall in this chapter don't seem convincing ("I was playing with my bro and I got OP"). As someone said below, it feels like Eita is another Bungo