I don't think I'll bet on Manchester United to even draw with Tottenham. The team lost their first meeting even when they had players available they still lose the match, so what can we say about their current performance? The match will be difficult predict on to me that is a big risk, I can't even predict a draw because Manchester United can really disappoint with their performances at any point. This second meeting will be play at Old Trafford, and since Manchester United doesn't have good performance to compete with Tottenham, they may not have any point on that match. I don't think Manchester United will have a good outcome there.
If Ten Hags decide to use Altay Bayindir as their goalkeeper in their next match against Tottenham, i think they can able to draw the game, but if they pick Onana, the game won't finish in a draw. Even with the injured players from Tottenham, they still have the quality to defeat Manchester United.
If we talk about the chances of winning it seems very slim but it is just speculation that Tottenham have a slightly superior chance of winning because they still have attackers who are capable enough to score while MU's attacking players are injured and their defense is very poor.
I never thought of blaming anyone even though Onana is still considered a bad goalkeeper but it all depends on the defense and the coach who provides the strategy.
To me betting on double chance seems much better for getting more certain results.
It would be better for me to bet double chance on Tottenham Spurs in this match, it will be a big risk to take Manchester united. I know presently the both teams are going through bad time, but Tottenham is still performing well than Manchester united, they are currently in fifth place, eight points ahead of Manchester United. For this reason, I was hoping that Tottenham might win the match, as you also mentioned, their attackers are still stronger than Manchester United's. This is the issue that Manchester United is dealing with, they don't usually take games seriously until they are losing, only then do they put in strong performances.
If you watch the way Onana's keep for Manchester United, you might also blame him because not all mistakes are made from the defense. In their last match against Nottingham Forest, for example, two goals were scored direct to his position, since this is still his first season, Onana's goal saving attempts are not very good. I hope Manchester United can perform well against Tottenham.