Wellens has been terrible on the right flank. He's barely contributed anything from there both on the attack and defensively. McCann is also struggling to defend against this Liverpool team, and he's barely gotten on the ball to really play a part.
Overall, it feels like our U23 squad has been forced to make do with limited resources, and it shows. Svidersky, a DM, is playing at left back. Wellens, a central midfielder, is playing on the right flank after Helm went off. Mark Helm before him was also playing on the right flank even though he's a more central player. Our U23s team is also very young; our only player above the age of 18 is DiShon Bernard. Liverpool, in contrast, have more experienced players in their lineup: Millar and Woodburn are two players with a bunch of first-team football (domestically and/or internationally) whilst we have no players with first-team experience.
I guess, in this context, this is to be expected. Our U23s has had a ton of turnover, and they're struggling to assert themselves against more mature players.