# C1621 — Relate the new Flood connections to the primary head differences

## Question

How do the locally shared Flood comparisons coexist with MT convergence and LXX/SP head displacement?

## Sources

```json
[
  "source_to_comparison_kernel.json",
  "Comparative_Study §§3.1,3.3,7.2"
]
```

## Opened utc

2026-09-29T15:04:17.527155+00:00

## Results

```json
{
  "rows": {
    "MT": {
      "lower_Flood_difference": -1580,
      "upper_difference": 1580,
      "head_difference": 0
    },
    "LXX": {
      "lower_Flood_difference": 530,
      "upper_difference": -30,
      "head_difference": 500
    },
    "SP": {
      "lower_Flood_difference": -5770,
      "upper_difference": 5580,
      "head_difference": -190
    }
  },
  "status": "reused primary arithmetic, now related to the new lower-Flood comparison modules"
}
```

## Finding

Each primary mode gap is a lower-plus-upper balance: MT−1580+1580=0; LXX530−30=500; SP−5770+5580=−190. The new lower-node packets therefore complement, rather than replace, the original head explanation.

## Reassessment

Separate source constraints from translation consequences in one dependency ledger.

## Checks

```json
{}
```

## Closed utc

2026-09-29T15:04:17.527708+00:00

## Record provenance

Exact record hash: `4bd7f4ea99a31b68cc1623f498e3729786678e1853c85737ae2391a9797ae802`

Source journal: `Research_Cycles/C1585_C1634/journal.json`